Vitamin D is important for bone and muscle strength, but the belief that it significantly reduces the risk of heart disease, cancer and numerous other conditions is questionable. Although Vitamin D supplements are still widely used, well designed studies have established that the supplements are not needed by most people. Moderate sunshine and normal diets provide adequate vitamin D for most people.
Dr. JoAnn Manson led one of the largest and most cited randomized trials that contradicted the belief that vitamin D supplements are a cure-all. In this discussion she explains why there has been confusion about vitamin D. She also addresses the importance of the structure of scientific studies in determining the effects of medications and supplements.

Dr. JoAnn E. Manson is an endocrinologist, epidemiologist, and Principal Investigator of several research studies, including the VITamin D and OmegA-3 TriaL (VITAL; PI with Dr. J. Buring since study inception in 2009); the COcoa Supplement and Multivitamin Outcomes Study (COSMOS, PI with Dr. H. Sesso since 2014); and others. Her primary research interests include randomized clinical prevention trials of nutritional and lifestyle factors related to heart disease, diabetes, and cancer and the role of endogenous and exogenous estrogens as determinants of chronic disease.

Understanding the accelerating expansion of our universe is one of the most important goals of modern astronomy. And it is a huge technical challenge. Paul Martini, with an international team of almost 500 researchers, built the unique telescope, the Dark Energy Spectroscopic Instrument (DESI), that captures (via spectrographs) light from galaxies and supermassive black holes (quasars) 11 billion light-years away. The first results are amazing, and provide the best explanation of dark energy and cosmic expansion that is currently possible. Dr. Martini describes the DESI project, its scientific significance, and the very exciting results so far.

In 2014, Jeffrey K Smith wrote "The Museum Effect" in which he put forth the case that museums, libraries and cultural institutions educate and civilize us as individuals and as societies. He suggested that visitors who spend time with their thoughts elevated, leave the institution as better people in some meaningful fashion than when they entered.

We will discuss this idea with Natalie Dykstra, the acclaimed biographer, of CHASING BEAUTY, about the life and legacy of Isabella Stewart Gardner, one of the first female art collectors in America. "Isabella Stewart Gardner is best known today for the Boston museum that bears her name, but as Dykstra makes clear in her luminous new biography, the Gilded Age doyenne was herself a figure to be reckoned with. A daughter of wealth who married into more, the flamboyant Gardner quickly became the queen of haute bohemia — and in the process, one of America’s most serious collectors. A lively portrait of a moment, a woman and the power of art". - NYT

Was Gardner doing essential work in the cultural education of her fellow Americans or just satisfying her own wanderlust by spending money on expensive indulgences. Join the conversation to express your views and discover more.

Natalie Dykstra, professor emerita of English at Hope College in Michigan, is a Fellow of the Massachusetts Historical Society and has served as a board member of the Biographers International Organization since 2020.

Historic preservationist and Civil War reenactor Joseph McGill Jr. has logged more than 200 nights sleeping in slave dwellings at historic sites in twenty-five states and the District of Columbia. In this enlightening personal account, he tells the story of his groundbreaking Slave Dwelling project. His quest to share the experience of the enslaved took him throughout the South, but also the North and the West, where people are often surprised to learn that such structures exist.

With journalist Herb Frazier, McGill reveals the fascinating history behind these sites and sheds light on larger issues of race in America

Herb Frazier is a Charleston S.C.-based writer. He is senior projects editor at the Charleston City Paper. Frazier has edited or reported for five daily newspapers in the South. He is the author of Behind God’s Back: Gullah Memories.

Joseph McGill Jr., of Ladson, S.C., is founder of the Slave Dwelling Project. He was previously a field officer for the National Trust for Historic Preservation. He is the former executive director of the African American Museum in Cedar Rapids, Iowa and the former director of history and culture at Penn Center, St. Helena Island, South Carolina.

In the wake of the Boston Tea Party, the British government in 1774 sought to rein in Massachusetts colonists with a series of harsh laws that closed Boston’s port and severely limited the right to representative government and due process of law. The fallout from these so-called Coercive Acts, including the attempted dissolution of the colony’s legislative branch, sparked intense debates within the community and became a critical factor on the road to the American Revolution.

Historians and current Massachusetts elected officials discuss and answer the audience questions on the meaning of the Coercive Acts today, with a particular focus on the role of the Massachusetts Legislature in our constitutional scheme of state government. The topics heatedly debated at the time—competing interpretations of representative government, the relative powers of the executive and legislative branches, the role of the individual and community in relation to government proper , and the consequences of resisting arbitrary power—still resonate strongly today.

John E. McDonough, DrPH, MPA is Professor of Public Health Practice in the Department of Health Policy & Management at the Harvard T.H. Chan School of Public Health and Director of Executive and Continuing Professional Education.