miércoles, 30 de septiembre de 2020

Antarctic sea ice may not cap carbon emissions as much as previously thought

The Southern Ocean surrounding Antarctica is a region where many of the world’s carbon-rich deep waters can rise back up to the surface. Scientists have thought that the vast swaths of sea ice around Antarctica can act as a lid for upwelling carbon, preventing the gas from breaking through the ocean’s surface and returning to the atmosphere.

However, researchers at MIT have now identified a counteracting effect that suggests Antarctic sea ice may not be as powerful a control on the global carbon cycle as scientists had suspected.

In a study published in the August issue of the journal Global Biogeochemical Cycles, the team has found that indeed, sea ice in the Southern Ocean can act as a physical barrier for upwelling carbon. But it can also act as a shade, blocking sunlight from reaching the surface ocean. Sunlight is essential for phytosynthesis, the process by which phytoplankton and other ocean microbes take up carbon from the atmosphere to grow.

The researchers found that when sea ice blocks sunlight, biological activity — and the amount of carbon that microbes can sequester from the atmosphere — decreases significantly. And surprisingly, this shading effect is almost equal and opposite to that of sea ice’s capping effect. Taken together, both effects essentially cancel each other out. 

“In terms of future climate change, the expected loss of sea ice around Antarctica may therefore not increase the carbon concentration in the atmosphere,” says lead author Mukund Gupta, who carried out the research as a graduate student in MIT’s Department of Earth, Atmospheric and Planetary Sciences (EAPS).

He emphasizes that sea ice does have other effects on the global climate, foremost through its albedo, or ability to reflect solar radiation.

“When the Earth warms up, it loses sea ice and absorbs more of this solar radiation, so in that sense, the loss of sea ice can accelerate climate change,” Gupta says. “What we can say here is, sea ice changes may not have such a strong effect on carbon outgassing around Antarctica through this capping and shading effect.”

Gupta’s coauthors are EAPS Professor Michael “Mick” Follows, and EAPS research scientist Jonathan Lauderdale.

The role of ice

Each winter, wide swaths of the Southern Ocean freeze over, forming vast sheets of sea ice that extend out from Antarctica for millions of square miles. The role of Antarctic sea ice in regulating the climate and the carbon cycle has been much debated, though the prevailing theory has been that sea ice can act as a lid to keep carbon in the ocean from escaping to the atmosphere.

“This theory is mostly thought of in the context of ice ages, when the Earth was much colder and the atmospheric carbon was lower,” Gupta says. “One of the theories explaining this low carbon concentration argues that because it was colder, a thick sea ice cover extended further into the ocean, blocking carbon exchanges with the atmosphere and effectively trapping it in the deep ocean.”

Gupta and his colleagues wondered whether an effect other than capping may also be in play. In general, the researchers have sought to understand how various features and processes in the ocean interact with ocean biology such as phytoplankton. They assumed that there might be less biological activity as a result of sea ice blocking microbes’ vital sunlight — but how strong would this shading effect be?

Equal and opposite

To answer that question, the researchers used the MITgcm, a global circulation model that simulates the many physical, chemical, and biological processes involved in the circulation of the atmosphere and ocean. With MITgcm, they simulated a vertical slice of the ocean spanning 3,000 kilometers wide and about 4,000 meters deep, and with conditions similar to today’s Southern Ocean. They then ran the model multiple times, each time with a different concentration of sea ice.

“At 100 percent concentration, there are no leaks in the ice, and it’s really compacted together, versus very low concentrations representing loose and sparse ice floes moving around,” Gupta explains.

They set each simulation to one of three scenarios: one where only the capping effect is active, and sea ice is only influencing the carbon cycle by preventing carbon from leaking back out to the atmosphere; another where only the shading effect is active, and sea ice is only blocking sunlight from penetrating the ocean; and the last in which both capping and shading effects are in play.

For every simulation, the researchers observed how the conditions they set affected the overall carbon flux, or amount of carbon that escaped from the ocean to the atmosphere.

They found that capping and shading had opposite effects on the carbon cycle, reducing the amount of carbon to the atmosphere in the former case and increasing it in the latter, by equal amounts. In the scenarios where both effects were considered, one canceled the other out almost entirely, across a wide range of sea ice concentrations, leading to no significant change in the carbon flux. Only when sea ice was at its highest concentration did capping have the edge, with a decrease in carbon escaping to the atmosphere.

The results suggest that Antarctic sea ice may effectively trap carbon in the ocean, but only when that ice cover is very expansive and thick. Otherwise, it seems that sea ice’s shading effect on the underlying organisms may counteract its capping effect.

“If one just considered the physics and the pure capping, or carbon barrier idea, that would be an incomplete way of thinking about it,” Gupta says. “This shows that we need to understand more of the biology under sea ice and how it underlies this effect.”

This research was supported in part by the U.S. National Science Foundation.



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Revamped MIT Climate Portal aims to inform and empower the public

Stepping up its ongoing efforts to inform and empower the public on the issue of climate change, MIT today announced a dramatic overhaul of the MIT Climate Portal, climate.mit.edu, which provides timely, science-based information about the causes and consequences of climate change — and what can be done to address it.

“From vast wildfires to an unusually active hurricane season, we are already getting a glimpse of what our climate-changed future looks like,” says Maria T. Zuber, MIT’s vice president for research. “With this website, we aim to communicate in rigorous but accessible ways what the science tells us: Yes, human-caused climate change is an urgent, serious problem; and yes, we can do something about it. Addressing climate change is an institutional priority, and this kind of public engagement is one way we hope to accelerate solutions.”

Survey research shows that increasing numbers of people, both in the United States and around the world, are concerned about climate change. But in the U.S., research also shows that members of the public rarely hear about or discuss the issue. Researchers at the Yale Program on Climate Change Communication and the George Mason University Center for Climate Change Communication have suggested that there might exist a climate change “spiral of silence,” in which “even people who care about the issue shy away from discussing it because they so infrequently hear other people talking about it.”

MIT’s efforts at public engagement on climate change are intended to help break this “spiral” — encouraging people to discuss climate change while also providing them with resources to discuss it in a way informed by the latest science and research. These engagement efforts are part of a commitment the Institute made in its 2015 Plan for Action on Climate Change “to offer the public a trusted source of climate change information, to engage leaders and citizens in the effort for solutions, and to use MIT’s expertise in online education to dramatically expand our reach.”

“We often talk about reaching people whom we call the ‘climate curious’ –— people who want to learn more about what climate change means for them and their communities and, of course, what they can do about it,” says John Fernández, the director of the MIT Environmental Solutions Initiative and a professor in the Department of Architecture. “Our goal is for this website to become a dependable resource for people across the U.S. and all over the world, so that they can have effective conversations about the urgency of the climate problem and our ability, even now, to reduce the grave risks it presents.”

Managed by the MIT Environmental Solutions Initiative, the MIT Climate Portal features a range of content, including a comprehensive climate change primer and climate-related news from all corners of the Institute. New features launched today include brief “explainers,” written by faculty and scientists at MIT, that provide high-level overviews of important topics like wildfires, carbon pricing, renewable energy, and ocean acidification. Also new to the website is an “Ask MIT Climate” feature, where members of the public can get answers to their own questions about climate change. (If you have a question about climate change that you would like the MIT Climate Portal to answer, email climate@mit.edu.)

The site also offers a clearinghouse of everything climate-related happening at MIT, from events to course offerings, to keep interested students, alumni, parents, faculty, and staff members up to date. Just as importantly, it creates a digital meeting place for members of the MIT community to share their latest work on climate change. Faculty, students, and staff across the Institute for years have made significant contributions to improving public understanding of and engagement with climate change, with tools like the climate simulators created by the MIT Sloan Sustainability Initiative; the Climate CoLab platform; and a number of public events, contests, and educational materials. The site will make these resources accessible in one place.

In addition to the MIT Climate Portal, MIT had previously launched two other digital resources for the public: an online, Webby Award-winning interactive primer on climate change, and a podcast series, TILclimate (short for “Today I Learned: Climate”). Both of these resources are accessible through the portal.

By enlisting MIT students in editorial aspects of the new website, the project is also proving to be a valuable hands-on educational tool. For example, for the “Ask MIT Climate” feature, students take questions about climate change submitted by users and then, under the guidance of MIT faculty members, research the answers and write responses.

“We see this as a powerful learning opportunity, a way for MIT students to strengthen their content knowledge about climate change, energy, and sustainability, but also to improve their ability to effectively communicate complex science and engineering topics to diverse audiences, a critical skill that will serve them well after they leave MIT,” says Fernández.

The new website is not static: New content will be developed and added over time, and all departments, labs, and centers at MIT that work on climate change are invited to contribute to it. Members of the MIT community who want to learn more about getting involved, or who have ideas for subjects to cover, are encouraged to contact the Climate Portal team.



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3 Questions: Nancy Hopkins on improving gender equality in academia

Over the course of her exceptional career, Amgen Professor of Biology Emerita Nancy Hopkins has overturned assumptions and defied expectations at the lab bench and beyond. After arriving at MIT in 1973, she set to work mapping RNA tumor virus genes, before switching her focus and pioneering zebrafish as a model system to probe vertebrate development and cancer.

Her experiences in male-dominated fields and institutions led her to catalyze an investigation that evolved into the groundbreaking 1999 public report on the status of women at MIT. These findings spurred nine universities, including MIT, to establish an ongoing effort to improve gender equity. A recent documentary,Picture a Scientist,chronicles this watershed report and spotlights researchers like Hopkins who champion underrepresented voices. She sat down to discuss what has changed for women in academia in the last two decades — and what hasn’t.

Q: How has the situation for women in science evolved since the landmark 1999 report?

A: It’s hard today to remember just how radical the 1999 report was at the time. I read it now and think, ‘What was so radical about that?’   

The report documented that women joined the faculty believing that only greater family responsibilities might impede their success relative to male colleagues. But, as they progressed through tenure, many were marginalized and undervalued. Data showed this resulted in women having fewer institutional resources and rewards for their research, and in their exclusion from important professional opportunities. When the study began, only 8% of the science faculty were women.

Former MIT Dean of Science Robert Birgeneau addressed inequities on a case-by-case basis, adjusting salaries, space, and resources. He recruited women aggressively, quickly increasing the number of women School of Science faculty by 50%. 

When the report became public, the overwhelming public reaction made clear that it described problems that were epidemic among women in science, technology, engineering, and mathematics (STEM). Former MIT President Chuck Vest and Provost Bob Brown addressed gender bias for all of MIT and “institutionalized” solutions. They established committees in the five MIT schools to ensure that inequities were promptly addressed and hiring policies were fair; rewrote family leave policies with input from women faculty; built day care facilities on campus; and recruited women faculty to high-level administrative positions.  

Today, we realize that the MIT report elucidated two underappreciated forms of bias: “institutional bias” resulting from a system designed for a man with a wife at home; and “unconscious or implicit gender bias.” Voluminous research by psychologists has documented the latter, showing that identical work is undervalued if people believe it was done by a woman. Refusal to acknowledge unconscious gender bias today is akin to denying the world is round.

Q: What do you hope people will take away from the “Picture a Scientist” film?

A: I hope people will better understand why women are underrepresented in science, and women of color particularly so. The film does a terrific job of portraying the range of destructive behaviors that collectively explain the question, “Why so few?” The movie also focuses on the courage it takes for young women scientists to expose these problems.

I hope people will agree that, despite all the progress for women in my generation, as the bombshell report from the National Academy of Sciences documented in 2018, sexual harassment and gender discrimination persist and still require constant attention. It remains a challenge to identify, attract, and retain the best STEM talent. And, as the movie points out, it’s critical to do so.

The producers have received an unprecedented number of requests to show the documentary in institutes, universities, and companies, confirming that underrepresentation remains a widespread and pressing issue.

Q: Where do we go from here? How can academia better support underrepresented groups in science moving forward?

A: People often say you have to “change the culture,” but what does that really mean? You have to do what MIT did: look at the data; make corrections, including policy changes if necessary; continue to track the data to see if the policies work; and repeat as needed. Second, as the National Academies report points out, you must reward administrators who create a diverse workplace. Top talent is distributed among diverse groups. You can only be the best by being diverse.

But how do you change the behavior of individual faculty? Years ago, President Vest told me, “Nancy, anything I can measure I can fix, but I don’t know how to fix marginalization.” His comment was prescient. We’re pretty good at fixing things we can measure. But not at retraining our own unconscious biases: preference for working with people who look just like us; and unexamined, biased assumptions about people different from us. But psychologists tell us all we have to do is ‘change the world and our biases will change along with it.’  Furthermore, they now have methods to measure change in our biases.

I championed this cause because I believe being a scientist is the greatest job there is. I want anyone with this passion to be able to be a scientist. I’m grateful I got to see change first hand. I just wish the change was faster, so young women like Jane Willenbring and Raychelle Burks in the movie can just be scientists.



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Milo Phillips-Brown receives inaugural MAC3 Society and Ethics in Computing Research Award

Milo Phillips-Brown, a postdoc in the ethics of technology in MIT Philosophy, was recently named the inaugural recipient of the MAC3 Society and Ethics in Computing Research Award, which provides support to promising PhD candidates or postdocs conducting interdisciplinary research on the societal and ethical dimensions of computing.

Phillips-Brown is being recognized for his work teaching responsible engineering practices to computer scientists. At MIT, he teaches two courses, 24.131 (Ethics of Technology) and 24.133 (Experiential Ethics), and has been an active participant in the activities of the Social and Ethical Responsibilities of Computing (SERC), a new cross-cutting area in the MIT Stephen A. Schwarzman College of Computing that aims to weave social, ethical, and policy considerations into the teaching, research, and implementation of computing.

“We are delighted to be able to work so closely with Milo,” says Julie Shah, an associate professor in the Department of Aeronautics and Astronautics, who along with David Kaiser, the Germeshausen Professor of the History of Science and professor of physics, serves as associate dean of SERC. “Over this past spring semester, Milo was a great thought partner in the design of SERC-related materials, including original homework assignments and in-class demonstrations for instructors to embed into a wide variety of courses at MIT,” says Shah.

“We knew we had an exceptional colleague when we selected Milo as our inaugural postdoc. We look forward to collaborating with him and his continued contributions to SERC,” adds Kaiser.

In addition to active learning projects, Phillips-Brown has been working with Shah and Kaiser on preparing the first set of original case studies on social and ethical responsibilities of computing for release in the coming months. Commissioned and curated by SERC, each case study will be brief and appropriate for use in undergraduate instruction and will also be available to the public via MIT’s open access channels.

“I’m thrilled to be the inaugural recipient of the MAC3 Society and Ethics in Computing Research Award. This is a time when we need to be exploring all possible avenues for how to teach MIT students to build technologies ethically, and the award is enabling me to help just do that: work with professors and students across the Institute to develop new models for ethical engineering pedagogy,” says Phillips-Brown.

Phillips-Brown PhD ’19 received his doctorate in philosophy from MIT and his bachelor’s in philosophy from Reed College. He is a research fellow in digital ethics and governance at the Jain Family Institute and a member of the Society for Philosophy and Disability. From 2015 to 2018, he directed the Philosophy in an Inclusive Key (PIKSI) Boston, a summer program for undergraduates from underrepresented groups. In January 2021, he will begin an appointment at Oxford University as an associate professor of philosophy in the Faculty of Philosophy and the Department of Computer Science.

The MAC3 Society and Ethics in Computing Research Award was established through the MAC3 Impact Philanthropies which provides targeted support to organizations and initiatives that impact early childhood, health and education, as well as the environment and the oceans.



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martes, 29 de septiembre de 2020

New website features podcasts from around MIT

The Office of Open Learning has created MIT Podcasts, an app that gathers all of MIT’s podcasts onto one page, with a list of new episodes updated daily. With some 30 podcasts from over a dozen departments, initiatives, offices, and clubs, the content represents a wide range of interests and expertise from across the MIT community.

Ranging from the MIT News podcast, which features audio articles and explainers on some of its most important and timely pieces, to MIT Sloan Management Review’s sports analysis podcast "Counterpoint," to the "Chalk Radio" podcast from OpenCourseWare featuring interviews with MIT faculty, there’s something for everyone in MIT’s audio landscape.

Every night the MIT Open website scans each podcast for the latest episodes and indexes them. Users can play back the latest episodes right on the site or subscribe to individual podcasts using your favorite podcast app. They can even subscribe to a podcast feed that combines all the MIT podcasts. In the future, the Open Learning engineering team plans to allow searching the transcripts of all the podcast episodes as well.

The flow of ideas and information is the lifeblood of MIT’s intellectual activity; as we continue to physically distance from one another, resources like the MIT Podcasts page can help make sure that flow never stops.



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Validating the physics behind the new MIT-designed fusion experiment

Two and a half years ago, MIT entered into a research agreement with startup company Commonwealth Fusion Systems to develop a next-generation fusion research experiment, called SPARC, as a precursor to a practical, emissions-free power plant.

Now, after many months of intensive research and engineering work, the researchers charged with defining and refining the physics behind the ambitious tokamak design have published a series of papers summarizing the progress they have made and outlining the key research questions SPARC will enable.

Overall, says Martin Greenwald, deputy director of MIT’s Plasma Science and Fusion Center and one of the project’s lead scientists, the work is progressing smoothly and on track. This series of papers provides a high level of confidence in the plasma physics and the performance predictions for SPARC, he says. No unexpected impediments or surprises have shown up, and the remaining challenges appear to be manageable. This sets a solid basis for the device’s operation once constructed, according to Greenwald.

Greenwald wrote the introduction for a set of seven research papers authored by 47 researchers from 12 institutions and published today in a special issue of the Journal of Plasma Physics. Together, the papers outline the theoretical and empirical physics basis for the new fusion system, which the consortium expects to start building next year.

SPARC is planned to be the first experimental device ever to achieve a “burning plasma” — that is, a self-sustaining fusion reaction in which different isotopes of the element hydrogen fuse together to form helium, without the need for any further input of energy. Studying the behavior of this burning plasma — something never before seen on Earth in a controlled fashion — is seen as crucial information for developing the next step, a working prototype of a practical, power-generating power plant.

Such fusion power plants might significantly reduce greenhouse gas emissions from the power-generation sector, one of the major sources of these emissions globally. The MIT and CFS project is one of the largest privately funded research and development projects ever undertaken in the fusion field.

"The MIT group is pursuing a very compelling approach to fusion energy." says Chris Hegna, a professor of engineering physics at the University of Wisconsin at Madison, who was not connected to this work. "They realized the emergence of high-temperature superconducting technology enables a high magnetic field approach to producing net energy gain from a magnetic confinement system. This work is a potential game-changer for the international fusion program​."

The SPARC design, though about the twice the size as MIT’s now-retired Alcator C-Mod experiment and similar to several other research fusion machines currently in operation, would be far more powerful, achieving fusion performance comparable to that expected in the much larger ITER tokamak being built in France by an international consortium. The high power in a small size is made possible by advances in superconducting magnets that allow for a much stronger magnetic field to confine the hot plasma.

The SPARC project was launched in early 2018, and work on its first stage, the development of the superconducting magnets that would allow smaller fusion systems to be built, has been proceeding apace. The new set of papers represents the first time that the underlying physics basis for the SPARC machine has been outlined in detail in peer-reviewed publications. The seven papers explore the specific areas of the physics that had to be further refined, and that still require ongoing research to pin down the final elements of the machine design and the operating procedures and tests that will be involved as work progresses toward the power plant.

The papers also describe the use of calculations and simulation tools for the design of SPARC, which have been tested against many experiments around the world. The authors used cutting-edge simulations, run on powerful supercomputers, that have been developed to aid the design of ITER. The large multi-institutional team of researchers represented in the new set of papers aimed to bring the best consensus tools to the SPARC machine design to increase confidence it will achieve its mission.

The analysis done so far shows that the planned fusion energy output of the SPARC tokamak should be able to meet the design specifications with a comfortable margin to spare. It is designed to achieve a Q factor — a key parameter denoting the efficiency of a fusion plasma — of at least 2, essentially meaning that twice as much fusion energy is produced as the amount of energy pumped in to generate the reaction. That would be the first time a fusion plasma of any kind has produced more energy than it consumed.

The calculations at this point show that SPARC could actually achieve a Q ratio of 10 or more, according to the new papers. While Greenwald cautions that the team wants to be careful not to overpromise, and much work remains, the results so far indicate that the project will at least achieve its goals, and specifically will meet its key objective of producing a burning plasma, wherein the self-heating dominates the energy balance.

Limitations imposed by the Covid-19 pandemic slowed progress a bit, but not much, he says, and the researchers are back in the labs under new operating guidelines.

Overall, “we’re still aiming for a start of construction in roughly June of ’21,” Greenwald says. “The physics effort is well-integrated with the engineering design. What we’re trying to do is put the project on the firmest possible physics basis, so that we’re confident about how it’s going to perform, and then to provide guidance and answer questions for the engineering design as it proceeds.”

Many of the fine details are still being worked out on the machine design, covering the best ways of getting energy and fuel into the device, getting the power out, dealing with any sudden thermal or power transients, and how and where to measure key parameters in order to monitor the machine’s operation.

So far, there have been only minor changes to the overall design. The diameter of the tokamak has been increased by about 12 percent, but little else has changed, Greenwald says. “There’s always the question of a little more of this, a little less of that, and there’s lots of things that weigh into that, engineering issues, mechanical stresses, thermal stresses, and there’s also the physics — how do you affect the performance of the machine?”

The publication of this special issue of the journal, he says, “represents a summary, a snapshot of the physics basis as it stands today.” Though members of the team have discussed many aspects of it at physics meetings, “this is our first opportunity to tell our story, get it reviewed, get the stamp of approval, and put it out into the community.”

Greenwald says there is still much to be learned about the physics of burning plasmas, and once this machine is up and running, key information can be gained that will help pave the way to commercial, power-producing fusion devices, whose fuel — the hydrogen isotopes deuterium and tritium — can be made available in virtually limitless supplies.

The details of the burning plasma “are really novel and important,” he says. “The big mountain we have to get over is to understand this self-heated state of a plasma.”

"The analysis presented in these papers will provide the world-wide fusion community with an opportunity to better understand the physics basis of the SPARC device and gauge for itself the remaining challenges that need to be resolved," says George Tynan, professor of mechanical and aerospace engineering at the University of California at San Diego, who was not connected to this work. "Their publication marks an important milestone on the road to the study of burning plasmas and the first demonstration of net energy production from controlled fusion, and I applaud the authors for putting this work out for all to see."​

Overall, Greenwald says, the work that has gone into the analysis presented in this package of papers “helps to validate our confidence that we will achieve the mission. We haven’t run into anything where we say, ‘oh, this is predicting that we won’t get to where we want.” In short, he says, “one of the conclusions is that things are still looking on-track. We believe it’s going to work.”



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lunes, 28 de septiembre de 2020

Industry and scientific leaders examine Covid-19-era inequities, emphasize rapid testing

“Covid-19 is both a wildfire and a spotlight. [It] has imposed a terrible burden of suffering on certain individuals, families, and communities. Yet it has left others almost untouched,” said President L. Rafael Reif at the inaugural MIT Forefront, a new virtual series created by the Institute. “But the pandemic has also forced the nation to focus on deep, longstanding inequalities. [T]oday, we will explore meaningful ways to disrupt the inequalities of Covid.”

 Through MIT Forefront, the Institute aims to scout the frontiers of science and technology for bold new answers to urgent global problems. On Sept. 24, the first session, “Disrupting the Inequalities of Covid-19 in Work and Health Care,” brought business and policy leaders and MIT experts together to share knowledge and discuss strategies for building a more equitable future.

The hourlong event, viewed live by more than 1,000 people, began with a video from Mariana Matus PhD ’18 and Newsha Ghaeli, co-founders of Biobot Analytics, whose technology creates public health profiles by sampling communities’ wastewater to track the spread of Covid-19, and has found that the virus can be detected in wastewater about seven to 10 days before clinical cases start to appear. “We have now produced data on 10 percent of the U.S. population. No other data set has been shown to have this predictive value,” said Matus. “We imagine, one day, this infrastructure will be deployed everywhere and will help us not only manage and get out of Covid-19, but also prevent the next epidemic.”

Economic impact and challenges for the future

Moderator Eric Schmidt, former CEO and chairman of Google and co-founder of Schmidt Futures, led the panel discussion. “It’s clear that we have not been able to solve the core problems that the pandemic has presented: How do we reopen the economy in such a way that people don’t get sick? How do we solve the inequality we see in the economic impact of Covid-19?”

Schmidt turned first to James Manyika, senior partner at McKinsey & Company and chairperson and director of McKinsey Global Institute, who noted, “Even before Covid-19, we had a very polarized labor market, and inequality was very high.” Manyika explained that the majority of workers most vulnerable to Covid-19’s economic impacts, such as layoffs, furloughs, reduced hours, and wages, are people earning less than $40,000 a year and are disproportionately women and people of color.

“We need to remember that, at most, only a third of us can work from home,” Manyika said. “The other two thirds have to physically show up somewhere. We have to find a way to open up, do it safely, and think about how we organize workplaces.”

“The Covid crisis is terrible, but it’s actually put a spotlight on problems we had already,” agreed MIT Institute Professor and economist Daron Acemoglu, pointing out that even before the pandemic, wages in many jobs were stagnant or declining and many good jobs had disappeared due to increased use of technology. “We have to find ways of rebuilding the economy and providing better institutional protections for workers, forging a new way of using our amazing technological know-how to create good jobs for the majority of the population. That’s a tall order.”

Pressed by Schmidt for specific solutions, Acemoglu suggested that government could play a bigger role in combating inequality by requiring better protections for workers and removing tax advantages for companies to automate jobs. Manyika observed that just 30 percent of U.S. counties generated two-thirds of the job growth over the last decade, suggesting government should incentivize companies to expand into parts of the country with few large employers. 

Role of the private sector

For a corporate perspective, Schmidt turned to panelists Ursula Burns and Indra Nooyi. Burns is a senior advisor of Teneo Ltd., the retired chairperson and CEO of both VEON Ltd. and the Xerox Corporation, and Nooyi is the former chairperson and CEO of PepsiCo and co-chair of the Reopen Connecticut Advisory Group. Both are members of the MIT Corporation.

“Companies seem to have decided to stay shut down until there is a vaccine,” said Schmidt. “How would you solve this problem for American and global business?”  

Burns advocated for more corporate responsibility. “We have a massive dislocation of employees that companies are not taking responsibility for,” she said. “Businesses in this time have to be more like government and take care of their workers in ways they haven’t before.  Shareholders will say this isn’t what companies are supposed to do. But we’re in a situation now where people have no safety net.”

“Large companies will do their part because they’re visible, and people will hold them accountable if they don’t treat their workers well,” said Nooyi. “They are doing right by their workers with health insurance and broadband access. But that’s just a small portion of our economy. Seventy-five percent of the economy doesn’t have the appropriate support system.”

Health care and vaccine access

Shifting to the medical aspects of the crisis, Schmidt turned to Bruce Walker, asking him to talk about prospects for a vaccine. Walker is founding director of the Ragon Institute of MGH, MIT and Harvard, professor of the practice of medicine at MIT, professor of medicine at Harvard Medical School, and a Howard Hughes Medical Institute Investigator.

“Discovering a vaccine is only the first step,” Walker said. “How do you make enough of it and deliver it to the people who need it?” He added that there are lessons to be learned from the HIV epidemic, where treatments rather than a vaccine began saving lives. “HIV taught us a lot about how to therapeutically address critical viruses, and we hope that happens in parallel with vaccine development. Effective treatment would be a real game changer.”

Manyika offered a reason for economic optimism: In California, where he serves on Governor Gavin Newsom’s Task Force on Business and Jobs Recovery, the state has successfully partnered with corporations to create jobs by doing “things we need to do anyway, jobs related to climate change and to addressing the digital divide, for example.” Acemoglu lauded these efforts but expressed skepticism that the private sector, left to its own devices, would carry out a true change of course. “If there is pressure on public companies they will act, but we don’t have agreement on what needs to be done.”

MIT’s response

As the session drew to a close, the panel discussed MIT’s carefully planned reopening of campus, which Schmidt said should be a model nationwide. Walker pointed to a similar approach at Massachusetts General Hospital, noting that aggressive testing and mask requirements have been key in both locations. “We’re not seeing secondary transmission when masks are worn,” he said. “If we can get everyone to wear masks, social distancing can even be reduced a little, and we could move forward.”

Considering how to prepare for the next pandemic, Walker said, “I think that MIT is the ideal place to be in this effort. Solving this problem involves multiple disciplines, and we need the best people in the country planning for the next one.” He cited examples such as using nanotechnology for more rapid vaccine development, aggressive surveillance to identify pathogens, and rapid testing to detect cases and reduce transmission.

Nooyi cautioned that MIT can’t solve a pandemic alone and said alignment between the federal and state governments is necessary. “Policy implications come into this,” agreed Walker. “People at MIT can help drive governments to act.”

Schmidt observed that MIT has pioneered best practices in Covid-19 response. “Why,” he wondered, “does the federal government do trillion-dollar bailouts but not fund rapid testing, which is the cornerstone of opening up businesses and schools?”

Final thoughts

“What can those of us watching do to disrupt these inequalities in work and health care?” asked an audience member. Walker answered that testing needs to be broadly available, and there should be a national strategy. “We have to depoliticize science and believe in it again,” suggested Acemoglu.

Nooyi agreed that low-cost, rapid testing is critical to safely reopening businesses and schools, pointing out one reason for the current high cost of testing: “We need to tell people who are supplying products for testing to stop price gouging.” She also cautioned that responsible public health policy must be used in concert with economic recovery measures, noting that “It’s not about lives or livelihoods, it’s lives and livelihoods.”

Burns commented on the need for an effective government. “When you have a global pandemic, we can’t have conversations that start with just companies or communities or neighborhoods,” she said. “We absolutely have to have a functioning set of government leaders to map out a strategy.”

Schmidt concluded, “My fervent hope is that MIT will now establish the principles of best practice and do everything possible to get these adopted throughout the nation.”



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viernes, 25 de septiembre de 2020

MIT and Indigenous Peoples Day

The following letter was sent to the MIT community today by President L. Rafael Reif.

To the members of the MIT community,

I write to announce three encouraging and related steps in our ongoing efforts to make MIT more welcoming and inclusive.

First, this summer, I asked Institute Community and Equity Officer John Dozier and Vice President for Human Resources Ramona Allen to reexamine our roster of Institute holidays. After outreach that included students, staff and faculty – and building on extensive work by then-interim ICEO Alyce Johnson – they concluded that while the overall reconsideration of holidays can and should continue, we should move swiftly now to consider renaming the holiday we recognize each year on the second Monday in October.

With the endorsement of Academic Council, beginning this year MIT will change the name of this holiday from Columbus Day to Indigenous Peoples Day, in recognition and celebration of the Native presence and voices in our community. You can learn more about the holiday’s significance through an October 14 lecture by MLK Visiting Scholar Patricia Saulis.

I offer my thanks to John, Ramona, Alyce, Chair of the Faculty Rick Danheiser and ICEO Program Director Beatriz Cantada for their care in advancing this recommendation.

And we owe a special debt of gratitude to two student groups – the American Indian Science and Engineering Society (AISES) and the Native American Students Association (NASA) – for their dedication to promoting equity and visibility on behalf of our Indigenous community.

Second, in the spring, Professor Craig Wilder, a former faculty advisor to AISES and the current advisor to NASA, will lead a class that will research and document MIT’s Native American history. The class will anchor a collaborative project that invites students, staff, alumni, community members and faculty from diverse fields to study and research MIT’s connections to Native nations and tribal lands, the histories of Native communities in the New England region, and the history of Indigenous students, faculty and staff at the Institute.

Third, before the pandemic, the Office of the Provost was in conversation with students and other MIT community members about designating a campus space for members of our Indigenous community to gather and share traditions and experiences. I am glad to report that we have identified options for such a space and are committed to act, once in-person indoor gatherings on campus are again permitted.

*   *   *

I would like to pause and recognize that, for many in our community, Columbus Day is an important and meaningful tradition, independent of its namesake. For many Italian Americans, Columbus Day presents an opportunity to celebrate their history, heritage and contributions to this nation, and to honor the struggle of immigrants from Italy who faced many decades of violence, exclusion and discrimination in the United States. We move forward with deep respect for every member of our community as we work to acknowledge the complex and evolving story of our nation.

It is natural to cherish our roots. They nourish the spirit and they keep us grounded. Yet they also enable us to grow new branches of understanding that rise upward to the light – and toward each other.

I am grateful for the partnership of our entire community as we aspire and work toward a better and stronger MIT.

Sincerely,

L. Rafael Reif



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New Semilab SE-2000 Spectroscopic Ellipsometer at MIT.nano

In nanofabrication, it is important to characterize and understand the physical, mechanical, and chemical properties of the various thin-film materials used to build devices. Ellipsometry is a particularly valuable technique for non-destructive optical characterization of a wide variety of thin-film materials — such as semiconductors, dielectrics, polymers, and metals — as well as complex multilayered structures. By measuring the change in the light polarization upon interaction with the matter, information such as thickness, refractive index, dielectric permittivity, composition, and doping can be revealed.

To expand thin-film measurement capabilities available to its researchers, MIT.nano recently acquired a Semilab SE-2000 Spectroscopic Ellipsometer. The instrument has been installed and qualified in the third-floor clean room in Building 12, and is now available for training and use.

The Semilab ellipsometer will augment the MIT.nano clean room metrology capabilities by addressing the need for a broad spectral range (from 245 nm–1,700 nm), autofocus, automatic goniometer for incidence angle adjustment (20-90 degrees), and large-area (300 mm) automatic stage with mapping capabilities, according to Anna Osherov, assistant director of user services for Characterization.nano. 

“We’re delighted to add this tool to the growing set of instruments and equipment available to MIT.nano users,” she says. “We’re developing a powerful set of ex-situ and in-situ capabilities for characterization and metrology in our facilities, and ellipsometry is yet another fundamental technique that will advance research for many users.”

With Microspot optics and an optical camera for region-of-interest visualization, the instrument is able to uniformly assess samples ranging from pieces up to 300 mm wafers. The SE-2000 replaces the capabilities that had been provided by the decommissioned Tencor UV1280, which was located in the second-floor Integrated Circuits Laboratory in Building 39.

Semilab designs and manufactures metrology equipment for the characterization of semiconductor and photovoltaic materials, and for the R&D and manufacturing processes of semiconductor devices, flat-panel displays, and solar cells.

For more information about MIT.nano’s tools and instruments, visit nanousers.mit.edu.



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MIT researchers highlight the impacts of logjams in river restoration projects

Researchers at MIT have modeled how engineered and natural wood jams change river water levels, enabling an assessment of the trade-offs in flood risk and habitat creation for river restoration projects.

In a recent paper published in Geophysical Research Letters, researchers Elizabeth Follett ’09 PhD ’16, postdoc Isabella Schalko, and Donald and Martha Harleman Professor of Civil and Environmental Engineering Heidi Nepf detail their analysis of 584 experiments measuring the backwater rise induced by model logjams in an experimental flume. Schalko ran these experiments, with the hope of filling gaps of the previously understudied physical processes to better explain just how water flow is impacted by large, densely packed groups of logs and to better inform current and future flood risk as well as river restoration projects.

“We’ve been missing a way to describe the physical mechanisms by which large groups of wood pieces affect the river water level,” says Follett, who is the lead author on the paper and a Royal Academy of Engineering Research Fellow at Cardiff University. “Our work allows researchers to characterize structural properties of wood jams from field measurements, by measuring the river water level up- and downstream of the jam and applying our new model.”

The team hopes that the structural metrics will be useful for a wide range of scientists and engineers. The paper has also had an unintended benefit: bridging gaps between research groups.

“What I like most about the paper is that it brings together two research communities; those who look more at in-stream wood, and those more interested in canopy shear flows,” says Schalko.

The findings could have significant implications for government or non-profit organizations engaging in restoration projects. According to the researchers, there is growing interest all over the world in river restoration projects; up until now, it was understood that adding wood to rivers was good for restoration because wood increases flow heterogeneity by increasing water depth. Despite the growing popularity of wood as a solution, the physical processes have not been studied in depth and are not always accounted for in flood prediction models.

“Flood risk and river restoration projects have attracted recent investments, but up to now it has been difficult to include the effect of wood in flood models to improve the design and assessment of these projects,” says Follett. “This is a first step in the direction of being able to theoretically describe how wood alters the flow conditions in a river.” When joined with existing information, the new data on wood jams should better inform flood risk and river restoration efforts in the future.



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Ibrahim Cissé, Ruth Lehmann, and Silvi Rouskin awarded 2021 Vilcek Prize

Associate professor of physics and biology Ibrahim Cissé, professor of biology and Whitehead Institute Director Ruth Lehmann, and Andria and Paul Heafy Whitehead Fellow Silvi Rouskin have been awarded 2021 Vilcek Prizes. The Vilcek Foundation was established in 2000 by Jan and Marica Vilcek, who emigrated from the former Czechoslovakia. Their prizes honor the outstanding contributions of immigrants in the sciences and the arts. Prizewinners will be honored in an April ceremony.

“The 2021 awards celebrate the diversity of immigrant contributions to biomedical research, to filmmaking, and to society,” Vilcek Foundation President Rick Kinsel said in a press release. “In recognizing foreign-born scientists and dynamic leaders in the arts and in public service, we seek to expand the public dialogue about the intellectual value and artistic diversity that immigration provides the United States.”

Ibrahim Cissé

A faculty member in the departments of Physics and Biology, Ibrahim Cissé received the Vilcek Prize for Creative Promise in Biomedical Science for using super-resolution biological imaging to directly visualize the dynamic nature of gene expression in living cells. 

Born in Niger, Cissé assumed he would be a lawyer like his father, but he soon became inspired by the science he saw in American films. His high school did not have a laboratory, so he completed high school two years early, enrolled in an English as a Second Language program at the University of North Carolina at Wilmington, and enrolled in Durham Technical Community College before transferring to North Carolina Central University, a historically Black college that was notable for its undergraduate science and mathematics research programs.

Following graduation, he spent a summer at Princeton University working in condensed matter physics. There, Cissé was confronted by physics professor Paul Chaikin with a question about elliptical geometry and particle density, using M&M’s candies. Cissé’s creative problem-solving enabled him and his fellow researchers to develop experiments for observing and quantifying their results, and they coauthored a paper that was published in Science magazine.

For graduate studies, he was at the University of Illinois at Urbana-Champaign, and earned a PhD under the supervision of single-molecule biophysicist Taekjip Ha, who was leading research in high-resolution, single-biomolecule imaging technology. Cissé’s interest in using physics to understand the physical processes in biology led him to a post-doctoral fellowship at École Normale Supérieure Paris. He showed that RNA polymerase II, a critical protein in gene expression, forms fleeting (“transient”) clusters with similar molecules in order to transcribe DNA into RNA. He joined the Howard Hughes Medical Institute’s Janelia Research Campus as a research specialist in the Transcription Imaging Consortium, before joining the MIT Department of Physics in 2014, and was recently granted tenure and a joint appointment in biology.

The Cissé Laboratory focuses on the development of high-resolution microscopy techniques to examine the behavior of single biomolecules in living cells, and his own research focuses on the process by which DNA gets decoded into RNA. His Time-Correlated Photoactivated Localization Microscopy (tcPALM) technique of imaging was able to peer inside living cells to study the dynamics of protein clusters. This discovery has led to breakthroughs in viewing the clustering and droplet-like behavior of RNA polymerase II during RNA transcription. In an interview with MIT News, he stated, “It’s becoming clearer that physics may be just as important as biology for understanding how cells work.”

Other national and international awards include the Young Fluorescence Investigator Award from the American Biophysical Society, the Pew Biomedical Scholars, and the National Institute of Health Director’s New Innovator Award. He is a Next Einstein Forum fellow and was listed in Science News’ Scientists to Watch.

Ruth Lehmann

Professor of biology and director of Whitehead Institute for Biomedical Research Ruth Lehmann received the Vilcek Prize in Biomedical Science. As a developmental and cell biologist, she investigates the biology of germ cells, which give rise to sperm and eggs.

The daughter of a teacher and an engineer, Lehmann was captivated by science from a young age. She grew up in Cologne, Germany, and majored in biology as an undergraduate at the University of Tübingen. Her Fulbright Fellowship in 1977 brought her to the University of Washington in Seattle, and served as the catalyst that spurred her career using fruit flies to understand germ cell biology. She went on to train with renowned fruit fly geneticists Gerold Schubiger and Jose Campos-Ortega, learning classical developmental biology and electron microscopy techniques. She then performed her doctoral research with future Nobel laureate Christiane Nüsslein-Volhard at the Max Planck Institute for Developmental Genetics. There, Lehmann probed the maternal genes that influence fruit fly embryo development — studies that ignited her fervor for germ cell research. Later, as a postdoc at the Medical Research Council Laboratory of Molecular Biology in Cambridge, England, she worked with Michael Wilcox and Peter Lawrence to pinpoint the molecules that control the fate of these vital cells.

Lehmann arrived at MIT in 1988, where she served as a professor and member of the Whitehead Institute for eight years. “Being an immigrant in the United States was exhilarating,” she says, “because of the openness to new ideas and the encouragement to take risks and be creative.”

She was recruited to the Skirball Institute at New York University (NYU), where she was appointed as the institute’s director, as well as the director of the Helen and Martin Kimmel Center for Stem Cell Biology, and chair of the Department of Cell Biology at NYU’s Langone Medical Center.

Lehmann returned to MIT this summer to launch the Lehmann Lab and become director of the Whitehead Institute in July.

Although she began her career focused on the formation and maintenance of germ cells, Lehmann has since revealed key insights into their migration — and more recently into mitochondrial inheritance. Her influential work regarding the development and behavior of these essential cells has also enriched related fields including stem cell biology, lipid biology, and DNA repair.

“It means so much to me to be recognized as an immigrant and a researcher,” says Lehmann. “In these days, immigrants don’t feel as welcomed as I did when I came to this country. For me, coming to the U.S. meant to be given a chance to live the dream of being a scientist. This allowed me to explore the fascinating biology of the germ line together with a group of incredibly talented trainees and staff, many of them immigrants themselves, and I share this wonderful recognition with them.”

Lehmann’s accolades include membership to the National Academy of Sciences, American Academy of Arts and Sciences, and European Molecular Biology Organization, as well as the Conklin Medal from the Society for Developmental Biology, the Porter Award from the American Society for Cell Biology, and the Lifetime Achievement Award from the German Society for Developmental Biology.

Silvi Rouskin

The Andria and Paul Heafy Whitehead Fellow at the Whitehead Institute, Silvi Rouskin received the Vilcek Prize for Creative Promise in Biomedical Science for developing methods to unravel the shapes of RNA molecules inside cells — aiding the potential development of RNA-based therapeutics.

The daughter of rock musicians in early-1980s communist Bulgaria, she grew up fascinated with the geometry of the flora and fauna around her. At 10, she started saving her lunch money to buy a miniature telescope. At 15 she knew that her best chances to study science would be in the United States, and so she joined a student exchange program in Idaho.

“I was not only allowed but encouraged to question my superiors,” she recalls. “I felt free to speak my mind, and often debated with my teachers.” Rouskin completed her GED and studied physics and biochemistry at the Florida Institute of Technology at 16.

As a staff research associate in the laboratory of Joseph DeRisi at the University of California at San Francisco, Rouskin first began studying RNA, using microarrays to detect and track viral infection. She opted to stay at UCSF to pursue her PhD in biochemistry and molecular biology.

She joined the Whitehead Institute in 2015, and established the Rouskin Lab to focus on the structure of RNA molecules, including viruses, and to determine how structure influences RNA processing and gene expression in HIV-1 and other viruses. Most recently, Rouskin uncovered the higher-order structure of the RNA genome of SARS-CoV2 — the virus that causes Covid-19  — in infected cells at high resolution.

“The goal of my own lab has been to perform basic RNA research with clear therapeutic applications and a particular focus on the vulnerabilities of RNA viruses,” says Rouskin. “I want my research to matter for medicine, and so I always approach my research with a cognizance of how my work can directly benefit people.”

Rouskin has also received the Harold M. Weintraub Graduate Student Award for outstanding achievements in biological sciences and the Burroughs Wellcome Fund Career Award at the Scientific Interface.



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Expanding access to the world’s top medical minds

Earlier this year, a little girl was struggling with a neurological condition that caused her to have 20 to 30 seizures a day. Her parents were working with a neurologist on a treatment plan, but they wanted a second opinion. Rather than trying to find a far-away, top-rated neurologist to get an appointment with, they used the services of InfiniteMD, a company that virtually connects patients and their families with some of the top medical specialists in the world.

Through the service, a leading pediatric neurologist reviewed a summary of the girl’s medical records and advised a different medication. Today, the girl is nearly seizure-free and is being weaned off some of her previous treatments. The parents report their daughter is now regaining the ability to eat soft food and is laughing and kicking playfully during bath times.

The breakthrough shows the power of broadening access to the world’s leading medical minds. That’s what InfiniteMD has been doing for the last four years, often with dramatic results.

The company combines a network of top physicians with a platform that pairs patients with specialists, organizes patient files for review, and facilitates connections via video chats or written reports. The consultations can help patients with treatment plans, diagnoses, test results, and more.

“Second opinions and expert consults are inherently complex,” InfiniteMD co-founder and Chief Operating Officer Christopher Lee PhD ’18 says. “Someone has a serious diagnosis or disease, then they have 30 minutes or 60 minutes to share everything about their care with a world-leading expert. In order for [the specialist] to be brought onto the same page and create a valuable interaction, there are a million moving parts that need to come together.”

Today, nearly 5 million people have access to InfiniteMD’s platform, primarily through their employers. The company says that over 70 percent of its consultations lead to a revised treatment plan, and more than a fifth of consultations lead to a revised or corrected diagnosis.

As Covid-19 has increased the demand for telehealth services, InfiniteMD’s team has taken steps to bolster its offerings in hopes of further improving access to the world’s top physicians. In August, the company agreed to be acquired by ConsumerMedical, a large organization that helps guide patients through the health care system, among other patient advocacy work.

“Right now, we basically say to patients, for example, ‘You shouldn’t get this surgery, you should do physical therapy instead,” InfiniteMD co-founder and Chief Executive Officer Babak Movassaghi MBA ’14 says. “But then what? Where should patients go? ConsumerMedical has an algorithm to connect you with the right doctor. They can make an appointment for you, and follow up with you, so [the acquisition] just made sense.”

A problem that’s personal

Movassaghi had an unconventional path to entrepreneurship, having first enjoyed a 13-year football career in NFL Europe before studying theoretical physics as a graduate student in his home country of Germany. After earning his PhD in medical physics from the University of Utrecht in 2005, he began a career in the health care industry. But a passion for entrepreneurship brought him to MIT, first to participate in the MIT Sloan School of Management’s Entrepreneurial Development Program (EDP) in 2011, then as part of the Sloan Fellows program two years later.

While Movassaghi was at Sloan, Lee was beginning his PhD in the Harvard-MIT Program in Health Sciences and Technology. The two students decided to team up for an MIT Hacking Medicine event, and went on to pursue various startup ideas throughout their time at MIT.

In 2015, Movassaghi’s close relative in Europe was diagnosed with cancer. He asked for their medical records, translated them from German to English, and had a contact at the Dana-Farber Cancer Institute take a look. The experience sparked an idea that resonated with both founders.

“We have immigrant backgrounds, and we’ve both been lucky to be educated, and we’ve both been very keen to playing a role for our family and extended family as health care advocates,” says Lee, who studied biomedical engineering before coming to MIT. “We realized this isn’t just a problem that affects us, it affects everyone around the world.”

Working on the idea as part of MIT’s Healthcare Ventures course, the founders pieced together existing services like Zoom to make a prototype. They also brought on a third co-founder, Harvard Medical School trained physician Liz Kwo, who was crucial in building the company’s early network of physicians. Kwo initially served as CEO but left the company in 2018.

Although the founders initially focused on helping international patients, they began expanding access to their service in the U.S. through partnerships with large employers and health insurers.

Today about 80 percent of InfiniteMD’s cases come from the U.S. The company’s network of more than 2,400 medical specialists were chosen based on their affiliations with leading hospitals, their experience, and research publications.

InfiniteMD’s software condenses disparate patient medical records into two-page summaries for doctors that can include things like MRIs and ultrasound images. The company can also facilitate collaboration between experts in different medical fields to handle complex cases.

When it comes to connecting patients and doctors, InfiniteMD can schedule live video consultations or, depending on patient preference, the two sides can communicate via asynchronous video snippets or messaging.

Overall, the company has focused on streamlining the telemedicine experience for patients and doctors without losing the value of expert consultations.

“For the patients, it couldn’t be more simple: It’s basically, ‘Hi, I have this, these are my questions,” Lee says. “On the back end, we have all these different roles for different people to allow thousands of these cases to be managed. Physicians also want it to be super simple. They’re like patients — they barely remember their log-ins. So we made an interface that’s also super easy for the physicians.”

Making every medical expert local

Movassaghi says InfiniteMD’s services have helped people avoid thousands of unnecessary surgeries in the U.S. over the years. One woman, a former Olympic skier, was scheduled to have her leg amputated before a second opinion facilitated by InfiniteMD led to a less life-altering procedure. Today the woman sends the founders pictures of herself hiking.

Covid-19 has changed things dramatically for InfiniteMD as more people prefer virtual consultations instead of hospital visits. With the ConsumerMedical acquisition, the founders, who will be joining the larger company, say they can move from a point solution to a part of a larger service to help patients get the most out of the health care system.

“With Covid-19, we’ve proven a lot of things are possible from home, and so there’s going to be an increase in virtual offerings,” Lee says. “Everything from physical therapy to wellness to simple checkups, all of these are headed in the direction of virtual. The beautiful thing about InfiniteMD is we’re agnostic in terms of what information is delivered. We’re really in the information business, so all of those offerings can be slotted into the IMD platform easily.”



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Provably exact artificial intelligence for nuclear and particle physics

The Standard Model of particle physics describes all the known elementary particles and three of the four fundamental forces governing the universe; everything except gravity. These three forces — electromagnetic, strong, and weak — govern how particles are formed, how they interact, and how the particles decay.

Studying particle and nuclear physics within this framework, however, is difficult, and relies on large-scale numerical studies. For example, many aspects of the strong force require numerically simulating the dynamics at the scale of 1/10th to 1/100th the size of a proton to answer fundamental questions about the properties of protons, neutrons, and nuclei.

“Ultimately, we are computationally limited in the study of proton and nuclear structure using lattice field theory,” says assistant professor of physics Phiala Shanahan. “There are a lot of interesting problems that we know how to address in principle, but we just don’t have enough compute, even though we run on the largest supercomputers in the world.”

To push past these limitations, Shanahan leads a group that combines theoretical physics with machine learning models. In their paper “Equivariant flow-based sampling for lattice gauge theory,” published this month in Physical Review Letters, they show how incorporating the symmetries of physics theories into machine learning and artificial intelligence architectures can provide much faster algorithms for theoretical physics. 

“We are using machine learning not to analyze large amounts of data, but to accelerate first-principles theory in a way which doesn’t compromise the rigor of the approach,” Shanahan says. “This particular work demonstrated that we can build machine learning architectures with some of the symmetries of the Standard Model of particle and nuclear physics built in, and accelerate the sampling problem we are targeting by orders of magnitude.” 

Shanahan launched the project with MIT graduate student Gurtej Kanwar and with Michael Albergo, who is now at NYU. The project expanded to include Center for Theoretical Physics postdocs Daniel Hackett and Denis Boyda, NYU Professor Kyle Cranmer, and physics-savvy machine-learning scientists at Google Deep Mind, Sébastien Racanière and Danilo Jimenez Rezende.

This month’s paper is one in a series aimed at enabling studies in theoretical physics that are currently computationally intractable. “Our aim is to develop new algorithms for a key component of numerical calculations in theoretical physics,” says Kanwar. “These calculations inform us about the inner workings of the Standard Model of particle physics, our most fundamental theory of matter. Such calculations are of vital importance to compare against results from particle physics experiments, such as the Large Hadron Collider at CERN, both to constrain the model more precisely and to discover where the model breaks down and must be extended to something even more fundamental.”

The only known systematically controllable method of studying the Standard Model of particle physics in the nonperturbative regime is based on a sampling of snapshots of quantum fluctuations in the vacuum. By measuring properties of these fluctuations, once can infer properties of the particles and collisions of interest.

This technique comes with challenges, Kanwar explains. “This sampling is expensive, and we are looking to use physics-inspired machine learning techniques to draw samples far more efficiently,” he says. “Machine learning has already made great strides on generating images, including, for example, recent work by NVIDIA to generate images of faces 'dreamed up' by neural networks. Thinking of these snapshots of the vacuum as images, we think it's quite natural to turn to similar methods for our problem.”

Adds Shanahan, “In our approach to sampling these quantum snapshots, we optimize a model that takes us from a space that is easy to sample to the target space: given a trained model, sampling is then efficient since you just need to take independent samples in the easy-to-sample space, and transform them via the learned model.”

In particular, the group has introduced a framework for building machine-learning models that exactly respect a class of symmetries, called "gauge symmetries," crucial for studying high-energy physics.

As a proof of principle, Shanahan and colleagues used their framework to train machine-learning models to simulate a theory in two dimensions, resulting in orders-of-magnitude efficiency gains over state-of-the-art techniques and more precise predictions from the theory. This paves the way for significantly accelerated research into the fundamental forces of nature using physics-informed machine learning.

The group’s first few papers as a collaboration discussed applying the machine-learning technique to a simple lattice field theory, and developed this class of approaches on compact, connected manifolds which describe the more complicated field theories of the Standard Model. Now they are working to scale the techniques to state-of-the-art calculations.

“I think we have shown over the past year that there is a lot of promise in combining physics knowledge with machine learning techniques,” says Kanwar. “We are actively thinking about how to tackle the remaining barriers in the way of performing full-scale simulations using our approach. I hope to see the first application of these methods to calculations at scale in the next couple of years. If we are able to overcome the last few obstacles, this promises to extend what we can do with limited resources, and I dream of performing calculations soon that give us novel insights into what lies beyond our best understanding of physics today.”

This idea of physics-informed machine learning is also known by the team as “ab-initio AI,” a key theme of the recently launched MIT-based National Science Foundation Institute for Artificial Intelligence and Fundamental Interactions (IAIFI), where Shanahan is research coordinator for physics theory.

Led by the Laboratory for Nuclear Science, the IAIFI is comprised of both physics and AI researchers at MIT and Harvard, Northeastern, and Tufts universities.

“Our collaboration is a great example of the spirit of IAIFI, with a team with diverse backgrounds coming together to advance AI and physics simultaneously” says Shanahan. As well as research like Shanahan’s targeting physics theory, IAIFI researchers are also working to use AI to enhance the scientific potential of various facilities, including the Large Hadron Collider and the Laser Interferometer Gravity Wave Observatory, and to advance AI itself. 



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jueves, 24 de septiembre de 2020

Saving Iñupiaq

MIT graduate student Annauk Denise Olin didn’t grow up speaking Iñupiaq, the language of her Alaska Native community. Nevertheless, she’s raising her son in the language — thanks in part to the grounding in linguistics she is gaining through the MIT Indigenous Language Initiative (MITILI), a master’s program for members of communities whose languages are threatened.

“The beauty of the Iñupiaq language is that the perspective and the wisdom of my ancestors has been preserved in the language,” says Olin, who is developing a curriculum for teaching Iñupiaq through MITILI. “If we lose our language, we lose our ability to see into the minds of the people who were able to thrive — for millennia — in one of the harshest climates in the world.”

That climate has been rapidly changing in the last two decades, with disastrous consequences for Olin’s family’s village, Shishmaref. A small community of about 600 people, Shishmaref is perched on tiny Sarichef Island just south of the Arctic Circle — a place where reduced sea ice, melting permafrost, and other impacts of climate change have come to threaten the community’s very existence. The effect of global climate change on Shishmaref is seen as among “the most dramatic in the world.”

“We’ve had several homes fall into the ocean. We’ve lost hundreds and hundreds of feet of land on our island. Historically, we would expect sea ice to form around our island in September or October. In the last few years, we had winters where sea ice would not form until January. This should serve as a warning to the rest of the world,” says Annauk, noting that the village has sought federal help to move to a new location — so far in vain.

Navigating climate change in Shishmaref

Helping her community to navigate the huge challenges presented by climate change is a key motivator for Olin, who started learning the Iñupiaq language intensively in 2016. At the time, she was working full time at the Alaska Institute for Justice (AIJ), a nonprofit dedicated to protecting the human rights of all Alaskans. As the research director of the AIJ’s climate change research and policy center, she worked with 15 Alaska Native villages (including Shishmaref) to begin developing a community-led relocation governance framework.

She says that language issues can present a barrier to such projects because elders in Alaska Native communities are not always fluent and literate in English, and the government rarely communicates in Iñupiaq. In fact, just this past January, Olin and members of the native village of Shishmaref partnered with the Alaska Public Research Interest Group to help produce census materials in Iñupiaq to fill this gap.

“Alaska has been historically underrepresented in the census,” she says. “We created public service announcements with speakers of Alaska Native languages to get more Alaska Native people to participate in the census so we can get adequate funding for our communities.”
 
A language shaped by the Arctic

Olin began teaching Iñupiaq after just one year of study at the Alaska Native Heritage Center in Anchorage. “Teaching and learning a language at the same time is very challenging and time-consuming, but it's common for second-language learners of endangered languages,” she says. One thing she’s learned so far is that Iñupiaq has almost 100 different terms for ice, but not for all of the conditions that people see today in Alaska; essentially, words fail to convey the devastation that climate change has wrought on the Arctic landscape.

“The Iñupiaq language has a complex and robust lexicon related to ice conditions in part because it is linked to our survival. If you’re out hunting and you aren’t able to describe to your hunting partner whether the ice is stable enough, it could cost your lives,” she says. “With climate change, some elders don’t have in their vocabulary words to describe how the ice is changing, so I think what’s important in the future is for us to be able to adapt the language to be able to describe these changing conditions exactly.”

For Olin, that means there need to be more young Iñupiaq speakers. “We need resources to teach in the language so that we have an upcoming generation of speakers even after our beloved elders pass on,” she said, noting that she is hoping her efforts will help undo the damage done by missionaries and the U.S. government, which for more than 100 years forced Iñupiat children to speak English in school.

A foundation in linguistics

Olin is beginning this work at home by speaking Iñupiaq to her son. “When I speak English to my son, it feels like a watered-down version of love, but when I speak Iñupiaq to him, the connection I feel with him is much stronger and intimate.”

To ensure that she is using the language properly, she is working with a mentor, native speaker Edna Ahgeak MacLean, a former faculty member at the University of Alaska Fairbanks and former president of Iḷisaġvik College. MacLean, who has produced both an Iñupiaq dictionary and a grammar, has helped Olin to script conversations so that she and her husband (a tribal member from another Alaska Native group, the Koyukon Athabascan, who speak Denaa’kke) can engage in simple activities — such as making pancakes — while conversing entirely in Iñupiaq.

At the same time, Olin is developing a curriculum for teaching Iñupiaq through her work at MITILI. Inspired by the work of the late MIT Professor Ken Hale, who dedicated his career to the study and support of indigenous languages of the Americas and of Australia, MITILI is a two-year program that provides a full scholarship that covers tuition, fees and health insurance, plus a stipend.

Olin is taking linguistics classes and working with her MIT advisor, Professor Norvin Richards, to gain an understanding of phonology, syntax, and language acquisition. “Some of the critical materials my mentor has written use many linguistic terms and concepts,” she says. “It has made a huge difference to be able to understand what tools are available to break down a lot of these linguistics-heavy resources.”

For example, Richards has helped Olin better understand how to combine morphemes, the smallest units of meaning in a language, to create words. “There are complicated rules that must be followed and practiced to correctly string morphemes together in Iñupiaq,” she says. For instance, in Iñupiaq it’s common for a morpheme to be attached to a word stem to indicate an action or state of being, a function usually performed in English by a verb.
 
Long-term survival of indigenous languages

“One of the things I appreciate about Annauk's work on Iñupiaq is how intellectually omnivorous she is,” says Richards, who has for decades worked to help revive endangered languages, including Wampanoag, a native language of Eastern Massachusetts, and Lardil, an Aboriginal language of Australia. “She's able to build on very careful work by the great Iñupiaq scholar Edna Ahgeak MacLean, but she's clearly determined to develop a language program that incorporates every technique that she thinks will work.”

Noting that the indigenous languages of the United States are all threatened, Richards says Olin is doing work that is critical to maintaining the world's linguistic diversity — learning Iñupiaq “through sheer force of will.” “She's tireless and dedicated, and very smart,” he says. “It's a real privilege to get to work with her.”

Supporting students like Olin has been the central mission of the MITILI since its founding in 2004. “The goals of the MITILI are ones that Ken Hale spoke and wrote about, eloquently and often,” Richards says. “One is to improve our understanding of the languages of the world, not by subjecting indigenous languages to study by outsiders, but by offering indigenous scholars ways to study their own languages with the tools that academic linguists have developed. And another, at least as important, is to try to help indigenous communities give their traditional languages their best chance of long-term survival.”

Olin’s ultimate goal is to fulfill this mission for her community, and her initial plan is to create an Iñupiaq mentor-apprenticeship program. “I’m also very interested in creating a school where the mission, leadership, and content is driven by Iñupiaq people and community — where we learn the language but also how to harvest and process traditional foods, sew traditional clothing, and most importantly, how to treat one another as human beings,” she says.

“As an Iñupiat, it is my responsibility to help provide a place where young people can have access to their identity and culture,” Olin says. “Many of our Iñupiat people are working to overcome historical trauma. Language is a powerful medicine that will help heal our communities.”



Story prepared by MIT SHASS Communications
Editorial and design director: Emily Hiestand
Senior writer: Kathryn O'Neil



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The meanings of masks

As The Washington Post has reported, “at the heart of the dismal U.S. coronavirus response” is a “fraught relationship with masks.” In this series of commentaries — inspired by an idea from associate professor of literature Sandy Alexandre — MIT faculty delve into the cultural, creative, and historic meanings of masks.

Drawing on discipline expertise, the professors offer new ways to think about, appreciate, and practice protective masking — currently a primary way to save lives and to contain the Covid-19 pandemic. The following are distilled excerpts from the commentaries to date; the full, image-rich Meanings of Masks series is available on the MIT SHASS website.  

In “The Expressive Power of Masks,” Sara Brown, an assistant professor and the director of design for MIT Theater Arts, writes that: “A performer in a mask is obscuring one identity in order to embody another one. Often, masks for performances have meanings that can be instantly understood by an audience that is familiar with the specific codes embedded in a particular theater form. In Japanese Noh theater, for instance, a mask worn by the principle character can indicate the character’s age and gender, and if the character is human or divine. Though the masks are static and cover the entire face, a skilled performer can invoke a range of expression through changing the mask’s orientation and relationship to light.”

Brown observes that “As we encourage masking at MIT, it’s worth considering how we too can utilize the expressive power of masks. I’m interested in hearing from MIT students,” she says, “for example, as to what affiliations or meanings they would want their masks to communicate. Colors, shape, and insignias, perhaps, could be used to communicate class year, major, residence hall, mood, etc. I trust our inventive students will have dozens of ideas for creating their own masks. And no matter what form it takes, wearing a mask during the pandemic shows that you care about protecting others.”

In “Masks as a Collective Cry for Justice,” Graham Jones, associate professor of anthropology, writes: “The mask is one of the most important human artifacts in all of anthropology. It is a tool of transformation that allows its wearers to transcend themselves, taking on timeless roles in ritual dramas, and as actors in a broader social drama. My favorite ritual masks in the world are those created by the First Nations of North America’s Northwest Coast. Used in dances that tell stories of creation, some of the masks have faces that dramatically transform when properly used in performance. The cloth face coverings that most of us now wear for purely practical, protective reasons may seem symbolically insipid in comparison to sacred masks used in ritual or performance. In practice, however, today's cloth masks have come to figure into everyday interaction rituals in ways that reflect central functions that anthropologists have long associated with masking.”

For me, Jones continues, “the iconic image of our times is of Black Lives Matter protestors of every race wearing masks emblazoned with the dying words of George Floyd: 'I can’t breathe.' These masks represent a symbolic condensation of the two public health crises that define this moment in American history: Covid-19, a disease that kills indiscriminately by attacking the respiratory system, and racism — a disease whose violence is most brutally felt in the choking-to-death of individual Black people at the hands of police. Such protest masks are a creative, expressive way of subsuming one’s identity within a social movement — and one’s voice within a collective cry for justice.”

In “Masks to Finesse an Archaic Political Order,” Jeffrey Ravel, professor of history, writes that in “Early Modern Europe (roughly 1400-1800 CE), masking most frequently occurred during Carnival, a period of raucous celebrations in February or early March that immediately preceded Lent, the six-week period of fasting and penance that culminated in Easter Sunday.” But, Ravel adds, “by the eighteenth century, mask-wearing among all classes and genders extended from Carnival through the summer, lasting half the year. Venetians not only wore masks during the week of Carnival, they continued to wear them through Lent and beyond at the theater, in gambling halls, in public marketplaces, and private homes. Foreign ambassadors and state officials, including the Doge (the head of the Venetian government), wore them during public ceremonies and private meetings and negotiations.”

Why would such extensive masking appeal in 18th-century Venice? Ravel explains that “the families who made up Venice’s patrician caste,” the minuscule percentage “who enjoyed the privilege to participate in the city-state’s political affairs,” had changed dramatically over the centuries, some growing richer and others declining until “by the eighteenth century, social realities did not correspond to the socio-political categories established five hundred years earlier.” Masking, Ravel says (citing fellow historian James H. Johnson) “had become a way to allow Venetians of all classes to intermingle socially, economically, and culturally for a large part of the year without calling into question the archaic political order, and it also allowed those from different socio-economic groupings in search of love to encounter each other in public spaces.”  

In “Masks as a Badge of Honor,” Eric Klopfer, head of the Comparative Media Studies/Writing program, writes: “My colleague in CMS/W, Scot Osterweil, often speaks about the ‘four freedoms of play.’ One of these freedoms is the ‘freedom to try on identities.’ Play gives us opportunities to pretend to be other people, creatures, or things. Sometimes we do this simply through imagination, but often we do this by changing our appearance. We play through costumes and masks in real life or through our choice of representations and apparel online, where avatars, or digital representations, can help us explore different identities. This can be empowering as it enables us to see ourselves in new ways; it can also be illuminating to see how others respond to such representations. 

“Masks clearly reveal something about mask wearers. Right now, they are being politicized in the U.S. and masks are conspicuous, so it is easy to use them as political identifiers if one chooses to do so. But we can and should change the meaning of this treasured item. In this pandemic era, what a mask really says is, 'I care about you.' That is an important and powerful message. It is one that we should champion and commend. We can also have fun with masks. They can be representations of our favorite characters in real life or fiction. They can take the place of funny and kitschy T-shirts. But the key to any of that is the understanding that, during a pandemic, the mask is a badge of honor, indicating the important role that you are playing in protecting the health of others during a crisis.”  

In “The Masks of New Possibilities,” Manduhai Buyandelger, an associate professor of anthropology, writes that “The resistance to wearing a mask for public health purposes in the United States reveals — in addition to political, racial, and gender problems — the degree to which Americans are accustomed to conditions and resources that are not easily accessible in other parts of the world. In Mongolia, where I grew up, a continental climate and high altitude make temporary face coverings or masks an essential part of everyday life. Wearing scarves to protect our faces from frostbite in sub-zero winters or from summer desert dust storms is a normal part of living in Mongolia.”

Buyandelger adds that “Masks are widely used to create alternative realities; examples range from traditional shamanic rituals in Inner Asia to computer-mediated virtual reality (VR) creations anywhere in the world. Such creative masks help wearers to suspend their everyday identities and assume new ones. Alternative worlds provide experiential and experimental spaces in which societies explore issues and share insights in a safe, impersonated way — outside of everyday experience. Hence, a mask often conceals one identity to reveal new possibilities. Seen in this light, virus protection masks offer an opportunity to replace a visage of fear with a public expression of strength as a community. Thus masks become pragmatic and expressive socio-cultural tools for societies and individuals to move forward in confidence.”

In “The Masks of Empire, Politics, and War,” Catherine Clark, an associate professor of cultural history, writes that three of the most meaningful historic masks of the early modern era include the gas masks that became essential gear on the WWI battlefields; the lightweight, prosthetic masks designed with individual care to cover the disfiguring facial wounds of returning WWI soldiers; and the masks made for ceremonial purposes in Africa, Asia, and the Americas that later circulated in 20th century Europe as influential artworks.

Clark also observes that while “mask-wearing is a new marker of American political divisions, in France facial coverings have long been at the heart of political debates. In 2011, France banned individuals from the public wearing of the niqab or burka, both garments typically worn by Muslim women that cover the wearer’s face. This ban built on a 2004 law that forbade ostentatious religious symbols in public schools. These symbols might include Christian crosses and Jewish kippas/yarmulkes, but public debates about the law centered on the Muslim veil as incompatible with the secular values of the French Republic. This spring, protective masks became mandatory in public in France, and yet, the burka and niqab remained banned. At the same time, in the U.S., many people of color described not feeling safe wearing masks, even needed protective masks, in public. These two cases, while based in very different issues, reveal the degree to which politics, cultural norms, and bias dictate who can cover their faces and how.”  

In “Masks as 公德心,” Emma Teng, the T.T. and Wei Fong Chao Professor of Asian Civilizations; and director of MIT Global Languages, writes that “In general, I think too much has been made of the supposed difference between American ‘individualism’ and Asian ‘collectivism.’ However, when it comes to wearing face masks, certain aspects of culture have almost certainly been coming into play.” Teng cites the “communitarian norms in East Asian countries” that support the ethos that “doing something for the community good is good for me also. This value is known as 公德心: in Mandarin: gongdexin; in Japanese: kootokushin; in Korean: Kongdokshim; and in English: ‘public spiritedness.’”

In addition, Teng notes that “Confucianism, a philosophy that has significantly influenced East Asian cultures, encourages great respect for elders and care for young children,” and that “if wearing a face mask can help protect someone’s grandparents, that is your duty.” Similarly, “it is considered a social responsibility to do one’s part in controlling the pandemic to ensure that schools remain open for the younger generation.” Teng also notes that “In East Asia, face masks are worn for a wide range of purposes. Combating urban pollution is a top reason, and it’s also common to wear a face mask to prevent allergies or to provide a little extra privacy in densely populated East Asian cities.” And “In cold and flu season … if you have a cold yourself, you are expected as a matter of basic etiquette to wear a face mask in public, in the office, and at school.”   

In “Persona: Masks in the Graeco-Roman World,” Stephanie Ann Frampton, an associate professor of classical literature, writes that "In Latin, one of the words for mask is persona, thought to have meant 'something through which sound passes' (per, 'through;” sono, “to make a sound'). Even in the time of Cicero, persona was already being used to describe the 'part' or 'character that one sustains in the world' — in other words, the role or roles we play in society.”

Frampton finds that “What’s most interesting about the masks in the classical period is that they often served the inverse purpose from the masks we’re wearing today to prevent the spread of disease. Theatrical masks in the ancient Graeco-Roman world functioned effectively as megaphones, leaving the mouth uncovered and allowing the voice to be projected to a large audience while covering the rest of the head and face with a typically exaggerated fixed expression. The best known masks from this period are, of course, those of comedy and tragedy, though many other types of masks were used for theatrical and religious performances, which ranged from satyr plays to cult rituals." Frampton suggests that "One of the things we can learn from ancient theatrical masks is that emotion and feeling are revealed through the eyes and not just the mouth — something we can take to heart as we communicate with others while we all wear masks during this pandemic.”


Series prepared by MIT SHASS Communications
Series editor/designer: Emily Hiestand
Consulting editor: Kathryn O'Neill

 



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