Reducing greenhouse gas emissions to mitigate climate change is perhaps the most urgent environmental and social challenge of our time. But a transition from fossil fuels to clean energy will require more solar panels, wind turbines, and electric vehicles—increasing demand for metals like copper, lithium, cobalt, and nickel. Mining these materials brings its own social and environmental impacts. In this fireside chat, MIT social scientist Scott Odell will join MIT Horizon executive editor Benjamin Rachlin to discuss the challenges at the intersection of critical mineral mining and the clean energy transition and what industry, government, and individual consumers can do to combat climate change and conserve natural resources.Register for this MIT Horizon webinar.

A martial art known for its many health benefits, tai chi is a moving study in meditation.Designed for small spaces, this class covers fundamental skills including postures, hand, and footwork. A short Yang style tai chi form will be taught.Special clothing is not necessary, but athletic shoes and loose fitting pants are recommended.Registration is required on our wellness class website. If you do not already have an account on this website, you'll need to create one. This is fee-based class and open to the entire MIT community.

Have some fun(nel) on a tunnel or sun(nel) walk! Join us for a 30-minute volunteer-led walk either through MIT’s famous tunnel system or around Killian Court. As the weather gets warmer, walk leaders may choose to take the group outside. Is the weather warm and you missed the start? Find the group on Killian Court and join in!Sun(nel) Walk Leaders will identify themselves by holding a white flag at the meeting location.Location details: Meet in the atrium by the staircase. [See image below]Prize Drawing: Attend a walk and scan a QR code from the walk leaders to be entered into a drawing for a getfit canvas boat tote bag at the end of the getfit challenge. The more walks you attend, the more entries you get. Winner will be drawn and notified at the end of April. Winner does not need to be a getfit participant.Disclaimer: Tunnel walks are led by volunteers. In the rare occasion when a volunteer isn’t able to make it, we will do our best to notify participants. In the event we are unable to notify participants and a walk leader does not show up, we encourage you to walk as much as you feel comfortable doing so. We recommend checking this calendar just before you head out.Getfit is a 12-week fitness challenge for the entire MIT community. These tunnel walks are open to the entire MIT community and you do not need to be a current getfit participant to join.

Have some fun(nel) on a tunnel or sun(nel) walk! Join us for a 30-minute volunteer-led walk either through MIT’s famous tunnel system or around Killian Court. As the weather gets warmer, walk leaders may choose to take the group outside. Is the weather warm and you missed the start? Find the group on Killian Court and join in!Sun(nel) Walk Leaders will identify themselves by holding a white flag at the meeting location.Location details: Meet in the atrium by the staircase. [See image below]Prize Drawing: Attend a walk and scan a QR code from the walk leaders to be entered into a drawing for a getfit canvas boat tote bag at the end of the getfit challenge. The more walks you attend, the more entries you get. Winner will be drawn and notified at the end of April. Winner does not need to be a getfit participant.Disclaimer: Tunnel walks are led by volunteers. In the rare occasion when a volunteer isn’t able to make it, we will do our best to notify participants. In the event we are unable to notify participants and a walk leader does not show up, we encourage you to walk as much as you feel comfortable doing so. We recommend checking this calendar just before you head out.Getfit is a 12-week fitness challenge for the entire MIT community. These tunnel walks are open to the entire MIT community and you do not need to be a current getfit participant to join.

Navigating Multiple Frictions: Experimental evidence for impacting voucher take-up at scale | Abhijeet Singh

Ten minutes for your mind@2:50 every day at 2:50 pm in multiple time zones:Europa@2:50, EET, Athens, Helsinki (UTC+2) (7:50 am EST) https://us02web.zoom.us/j/88298032734Atlantica@2:50, EST, New York, Toronto (UTC-4) https://us02web.zoom.us/j/85349851047Pacifica@2:50, PST, Los Angeles, Vancouver (UTC=7) (5:50 pm EST) https://us02web.zoom.us/j/85743543699Almost everything works better again if you unplug it for a bit, including your mind. Stop by and unplug. Get the benefits of mindfulness without the fuss.@2:50 meets at the same time every single day for ten minutes of quiet together.No pre-requisite, no registration needed.Visit the website to view all @2:50 time zones each day.at250.org or at250.mit.edu

Time: 3:00 PM - 4:00 PMSpeaker: Grant Barkley (Harvard)Title: Infinite root systems in algebra and geometryAbstract: We describe how biclosed sets of roots in a positive root system simultaneously give a natural completion of the weak order on a Coxeter group and a combinatorial skeleton for Calabi-Yau categories. In particular, for affine root systems, we show that biclosed sets form a profinite semidistributive lattice, strengthening the lattice property conjectured by Dyer. We also show that each torsion class in the category of modules for an affine type A preprojective algebra has an associated biclosed set of roots, which uniquely determines the spherical modules in the torsion class; in this way biclosed sets behave like stability conditions on the category. We apply biclosed sets to give a new proof that Bruhat intervals have EL-labelings and to prove an extension of the Gelfand-Serganova theorem on Coxeter matroids to infinite Coxeter groups. We also prove new cases of the combinatorial invariance conjecture for Kazhdan-Lusztig polynomials.____________________________________________________________________________________________________Time: 4:15 PM - 5:15 PMSpeaker: Yuhan Jiang (Harvard)Title: Enumeration in stochastic processes and polyhedral geometryAbstract: This dissertation explores the combinatorics of Markov chains and polyhedral geometry, with a focus on the asymmetric simple exclusion process (ASEP) and the Ehrhart theory of polytopes. The first part addresses the stationary distribution of stochastic models, including the open ASEP, the Arndt-Heinzel-Rittenberg (AHR) model and the doubly ASEP (DASEP).We give a two-layer simple random walk interpretation for the open ASEP model, a tableaux formula for the AJR model, and show that the DASEP exhibits homomesy phenomenon.The second part of the dissertation studies the Ehrhart theory of positroid polytopes and alcoved polytopes. We present combinatorial formulas for the $h^*$-polynomials of positroid polytopes and alcoved polytopes.

Speaker: Zhihan Wang (Cornell)Title: Shape of Mean Curvature Flow Passing Through a Non-degenerate SingularityAbstract:A central question in geometric flow is to understand the change of geometry and topology after passing through singularities. In this talk, I will focus on mean curvature flow, the negative gradient flow of area functional, and explain how the local dynamics influence the shape of the flow near a singularity, as well as how the geometry and topology of the flow change after passing through a singularity with generic dynamics. This talk is based on the joint work with Ao Sun and Jinxin Xue.

Speaker: Thomas Hameister (Boston College)Title: Relative Duality for Hitchin SystemsAbstract: The Hitchin fibration for a reductive group G is a certain generalized abelian fibration, which admits remarkable duality properties. Namely, the "semi-classical limit" of geometric Langlands asserts that the Hitchin fibrations for G and for its Langlands dual Gv are generically dual abelian fibrations. In this talk, we will explore a relative form of this duality, in the sense of Ben-Zvi, Sakellaridis, and Venkatesh. We associate to a spherical variety or symplectic representation particular sheaves on the Hitchin moduli spaces for G and Gv which we conjecture to be Fourier-Mukai dual, generalizing a conjecture of Hitchin. We will show how this duality reduces to simple calculations in invariant theory, which are confirmed in many examples in our work and which have been proved in the strongly tempered case in the forthcoming work of Ben-Zvi, Sakellaridis, and Venkatesh. This is based on joint work with Zhilin Luo and Benedict Morrissey.

Title: TBD

Talk Title: When worlds collide: porous polymer synthesis and simulation

Get ready to be blown away by the latest and greatest research projects coming out of MIT! Join us at the MIT Wong Auditorium for an exciting showcase of innovative ideas, cutting-edge technology, and mind-blowing discoveries. Hear in-person engaging presentations from the brilliant minds of MIT PhDs & postdocs. Don't miss this opportunity to learn more about scientific discoveries unfolding right here in Cambridge, MA!Get your free tickets here.

For Researchers Interested in Commercializing their New TechnologyExplore taking your new technology to the marketplace Get entrepreneurial training, support to identify customers Learn how to apply for $50,000 from the NSFIncrease your chances of receiving an SBIR/STTR awardClick here for more details

Time: 12:00 PMLocation: Wellesley, MA

Every Wednesday night you are invited to come to The Table for peaceful Christian worship in the Chapel at 5:15 pm and dinner in the Main Dining Room of W11 at 6:30 pm.We worship with beautiful songs, open conversation about the Scriptures, prayers and a simple sharing of communion around the altar. Then we enjoy dinner together and good company together. Whether you come every week or just drop by once in a while, there is a caring community for you at the Table.You are truly welcome to come as you are: undergrad, grad, or post-doc; sure of your faith or wondering what it is all about; gay, straight, bi, trans*, questioning. Please join us for no-pressure worship and fellowship.Hosted by the Lutheran Epsicopal Ministry @ MIT. For more information, or to verify gathering times during holiday and vacation periods, please contact chaplains Andrew Heisen (heisen@mit.edu) and Kevin Vetiac (kvet246@mit.edu).

Many people think gentle yoga is too easy and not an effective form of fitness. Think again! You can practice yoga in ways that are both active and gentle at the same time.Come enjoy the many known benefits of yoga through:the practice of active yet gentle, rhythmic movementheld yoga poses and vinyasa flow (moving from pose to pose via the breath)pranayam (breath work)relaxation and meditationIn this well-rounded class, Celeste LeMieux, 500 hr certified Kripalu Yoga Instructor, provides clear instructions and modifications, making it accessible and beneficial to practitioners of all ages and stages of yoga practice and life.You will leave class feeling both stretched and strengthened while also feeling more calm and relaxed. This class is the perfect mid-week reset for body and mind. Come see how less really can be more!Registration is required on our wellness class website. If you do not already have an account on this website, you'll need to create one. This is fee-based class and open to the entire MIT community.

Refuge @ MIT. Join our weekly gathering for Christian students and seekers as we have worship, prayer and Bible study each Wednesday evening. We share some food and enjoy an in depth Bible study, open to all students at MIT.

In honor of Earth Week, please join us for a thought-provoking evening with Professor Susan Solomon to celebrate her recent book, Solvable: How we healed the Earth, and how we can do it again.5:30 p.m. | 54-100, the Dixie Lee Bryant (1891) Lecture Hall Author’s talk and Q+A, moderated by Professor John Fernández, Director of the MIT Environmental Solutions Initiative6:30 p.m. | 55-Atrium – Tina and Hamid Moghadam Building Book signing and reception in the Fred A. Middleton (1971) Atrium, Building 55. Limited copies of Professor Solomon’s book will be available for purchase.Please register to attend in person or via live-stream.Questions? Contact Allison DrovairosAbout the Book: We solved planet-threatening problems before, Susan Solomon argues, and we can do it again. Solomon knows firsthand what those solutions entail. She first gained international fame as the leader of an expedition to Antarctica in 1986, making discoveries that were key to healing the damaged ozone layer. She saw a path—from scientific and public awareness to political engagement, international agreement, industry involvement, and effective action. Solomon, an atmospheric scientist and award-winning author, connects this career-defining triumph to the inside stories of other past environmental victories—against ozone depletion, smog, pesticides, and lead in gasoline—to extract the essential elements of what makes change possible.About the Author: Susan Solomon is the Lee and Geraldine Martin Professor of Environmental Studies at the Massachusetts Institute of Technology, and is the current Chair of the Program in Oceans, Atmospheres and Climate in the Department of Earth, Atmospheric and Planetary Sciences. Prior to coming to MIT and joining the EAPS faculty in 2012, she was a scientist at NOAA in Boulder, Colorado and an adjunct professor at the University of Colorado from 1982-2011 where she first theorized about the cause behind the Antarctic ozone hole. In 1986 and 1987, she served as the Head Project Scientist of the National Ozone Expedition at McMurdo Station, Antarctica, making some of the first measurements that confirmed chlorofluorocarbons (CFCs) as the culprit. This pioneering work is among the foundations for the Montreal Protocol—the landmark treaty limiting global CFC emissions—which, 30 years its signing, became a resounding environmental success story, with Solomon documenting evidence of the ozone hole’s healing in response in work carried out at MIT. In March of 2000, Solomon received the National Medal of Science, the United States’ highest scientific award. A member of the National Academy of Sciences and the American Philosophical Society, Solomon has also earned the highest awards of the American Geophysical Union (the Bowie Medal), the American Meteorological Society (the Rossby Medal), and the Geochemical Society (the Goldschmidt Medal). She also received the Grande Medaille of the Academy of Sciences in Paris for her leadership in ozone and climate science in 2008 and the Crafoord Prize of the Swedish Academy of Sciences in 2018. She served as co-chair of the Fourth Assessment of the Intergovernmental Panel on Climate Change (IPCC, 2007) climate science report, which went on to be recognized with the Nobel Peace Prize. In 2008, she was named one of the year’s 100 most influential people in Time magazine.

Spring is here and cycling is fun again! Come to The Bike Lab for free bike lights and reflective materials to improve your visibility and safety on the road. We have bike lights, reflective vests, and reflective snap bracelets, and can also help with bike repair if your bike needs any adjustments. Ride safe!Location: https://maps.app.goo.gl/r6oC91L1SstX63fPASponsors: GSC Funding Board

Jazz Advanced Music Performance (AMP) ConcertFeaturing student performers Matthew Michalek, Alex Jin and Andrea Marcano-Delgado!Livestream: https://web.mit.edu/webcast/mta/f24/This project is presented as part of Artfinity, an Institute-sponsored event celebrating creativity and community at MIT. Artfinity is organized by the Office of the Arts.