Dark matter accounts for some 27 percent of the universe but is invisible. One promising technique to reveal it is the analysis of gravitational lensing that very occasionally aligns galaxy clusters.

The much-noted “cosmic question mark” image for this event is the result of a rare alignment between two distant galaxies due to gravitational lensing. Professor Jacqueline McCleary explains how cosmologists use such examples of weak gravitational lensing between galaxy clusters to explore the nature of elusive dark matter and its interaction with galaxies. She discusses how cosmologists gather and analyze data from observatories on mountaintops, in the stratosphere, and in space.

Dr. McCleary is a collaborator in the Local Volume Complete Cluster Survey (LoVoCCS), the SuperpressureBalloon-borne Imaging Telescope (SuperBIT), and COSMOS-Web (a JWST collaboration).

Jacqueline McCleary is an observational cosmologist who uses galaxy clusters as a laboratory in which to explore the nature of dark matter and its interaction with galaxies. She received her Ph.D. in physics at Brown University and served as a post-doctoral fellow at NASA’s Jet Propulsion Laboratory before joining Northeastern University. She is a collaborator in the Local Volume Complete Cluster Survey (LoVoCCS), the SuperpressureBalloon-borne Imaging Telescope (SuperBIT), and COSMOS-Web (a JWST collaboration).

Judith Rosen worked in publishing and bookselling for a dozen years before writing about them both as the long-time bookselling editor and New England correspondent for Publishers Weekly. Some of her interviews and articles have been collected in Writing for Your Life and in The Writer's Handbook.

Join Suffolk Law Professor Ragini Shah in a conversation about her first book, Constructed Movements: Extraction and Resistance in Mexican Migrant Communities with Professor Shannon Gleeson, School of Industrial and Labor Relations and the Brooks School of Public Policy, Cornell University.

Theoretically sophisticated and poignantly written, Constructed Movements centers stories from communities in Mexico profoundly affected by emigration to the United States to show how migration extracts resources along racial lines. Shah chronicles how three interrelated dynamics—the maldistribution of public resources, the exploitation of migrant labor, and the US immigration enforcement regime—entrench the necessity of migration as a strategy for survival in Mexico. She also highlights the alternative visions elaborated by migrant community organizations that seek to end the conditions that force migration. Recognizing that reform without recompense will never right an unjust migratory system, Shah concludes with a forceful call for the US and Mexican governments to make abolitionist investments and reparative compensation to directly counteract this legacy of extraction.

Shannon Gleeson is the Edmund Ezra Day Professor at the Cornell University School of Industrial and Labor Relations and the Brooks School of Public Policy. Her books include Legalized Inequalities: Immigration and Race in the Low-Wage Workplace, forthcoming; Advancing Immigrant Rightsin Houston; Scaling Migrant Worker Rights: How Advocates Collaborate and Contest State Power; Precarious Claims: The Promise and Failure of Workplace Protections in the United States; and Conflicting Commitments: The Politics of Enforcing Immigrant Worker Rights in San Jose and Houston.

Join Dr. Jonathan Michael Square at Charles River Museum of Industry & Innovation for an in-depth exploration of the history of negro cloth and its pivotal role in the American fashion industry, with a focus on its production in Lowell, Massachusetts. The talk will also examine how enslaved individuals utilized textiles as a form of self-fashioning in the face of the deprivation of their self-hood.

Dr. Jonathan Michael Square is the Assistant Professor of Black Visual Culture at Parsons School of Design. He earned a PhD from New York University, an M.A. from the University of Texas at Austin, and a B.A. from Cornell University.

The Pulitzer Prize-winning biographer of celebrated American women, Megan Marshall has been hailed as a “gifted storyteller” (New Yorker) at “the front rank of American biographers” (New York Times).

Join us to hear about her latest work “After Lives: On Biography and Mysteries of the Human Heart” and gain insight from her discussion with fellow biographer Janice Nimura. Don’t miss their conversation about remarkable women in history and their own lives and work. Special for Women’s History Month.

From proposals to “I do.” Book-lovers find their perfect match at bookstores they love.

What is the most romantic place to get engaged? A bookstore, of course. The perfect wedding venue? A bookstore! Book-loving couples from all over America agree, and Bookstore Romance celebrates not only a couple’s love for each other, but also their love of books and bookstores.

In this talk, author Judith Rosen will join a panel of Boston-area booksellers, booksellers, including Trident Booksellers & Café co-owner Courtney Flynn; More Than Words Retail Business Manager Annie Sandoli; and Christina Pascucci-Ciampa, owner of All She Wrote Books, to discuss this swoon-worthy book and answer your questions about bookselling, book marketing, creating community, and love!

In Bookstore Romance: Love Speaks Volumes, former Publishers Weekly journalist Judith Rosen tells the stories of 24 couples who were engaged or married in their favorite independent bookstores. This irresistible book gives us an opportunity to celeorare ove in its many torms-tne ove these couples share with one another, the love they share for their local indie bookstores, and the love these bookstores and booksellers pour into their communities every single day as they cultivate these special spaces - third spaces - where people of all sorts gather together and feel at home.

Presented with Brandeis University Press.

Cambridge Forum is pleased to feature Omo Moses, son of legendary civil rights organizer, Robert P. Moses, talking about his new book, The White Peril.

The book is a coming-of-age story, a multigenerational diary, a father-son road trip, a searing account of the Black male experience, and a work that powerfully revives Reverend Moses’s demand for liberation. Moses deftly interweaves his own life story with excerpts from both his great-grandfather’s sermons and the writings of his father, Bob Moses. The result is a compelling memoir that spans three generations of an African-American family, shining a light on the Black experience, and demanding racial justice. Omo will be joined in conversation by Jack Tchen, the Clement A. Price Professor of Public History & Humanities, and Director of the Price Institute on Ethnicity, Cultures, and the Modern Experience at Rutgers University. Tchen, author '"Yellow Peril! An archive of anti-Asian fear" (2016) will be in dialogue with Omo Moses' about Western colonial fears of the non-white Protestant/Christian world. Reverend Moses' remarkable 1919 "White Peril" and Tchen's "Yellow Peril!" get to the roots of liberation struggles, peace-making, and global wellbeing today, especially in the era of climate chaos.

Paris Alston, host of GBH News and incoming host of Basic Black will moderate the discussion.

Listen to Cambridge Forum archived interview with Bob Moses here .