He spent two decades hosting the PBS series, during the formative years of personal computing. It was seen in more than 300 cities at its peak.

His discovery of the protein fragment GLP-1 was crucial in the development of Ozempic, Wegovy and other blockbuster obesity and diabetes treatments.

When not guiding students in a compassionate approach to patient care, he led a tiny publishing imprint that put out a much-rejected debut novel that won a surprise Pulitzer Prize.

Prominent business and government figures spread rumors about the attack on Brown University’s campus this month, reigniting questions about accountability in online discourse.

© Christopher Capozziello for The New York Times