EditorialEmily Riehl, a mathematician at Johns Hopkins University, in a classroom of the Institut Henri Poincaré in Paris, on June 14, 2023. (Yulia Grigoryants/The New York Times)
EditorialEmily Riehl, a mathematician at Johns Hopkins University, in a classroom of the Institut Henri Poincaré in Paris, on June 14, 2023. (Yulia Grigoryants/The New York Times)
EditorialEmily Riehl, a mathematician at Johns Hopkins University, in a classroom of the Institut Henri Poincaré in Paris, on June 14, 2023. (Yulia Grigoryants/The New York Times)
EditorialEmily Riehl, a mathematician at Johns Hopkins University, in a classroom of the Institut Henri Poincaré in Paris, on June 14, 2023. (Yulia Grigoryants/The New York Times)
EditorialEmily Riehl, a mathematician at Johns Hopkins University, in a classroom of the Institut Henri Poincaré in Paris, on June 14, 2023. (Yulia Grigoryants/The New York Times)
EditorialA man exhales after vaping, which the government has slowly embraced as a less addictive alternative to cigarettes, in New York, Sept. 9, 2019. (Brittainy Newman/The New York Times)
EditorialThe company headquarters of Purdue Pharma, makers of the highly addictive painkiller OxyContin, in Stamford, Conn., May 23, 2018. (George Etheredge/The New York Times)
EditorialGorée Island, one of a handful of islands reachable by ferry from mainland in Dakar, Senegal on Sept. 22, 2019. (Sebastian Modak/The New York Times)
EditorialFrom left: Yorely Valero, David Ayala Alfonso and Andrea Ferrero box items for Cuarentena Baking customers in Mexico City, Sept. 5, 2020. (Meghan Dhaliwal/The New York Times)
EditorialActor David Corenswet flashes a confident smile and wink just after taking off in a Piper single-prop airplane from Van Nuys Airport in Los Angeles, Nov. 17, 2019. (Michelle Groskopf/The New York Times)
EditorialLester Grinspoon at his home in Massachusetts in 2004, four years after retiring from the faculty of Harvard Medical School, where he spent 42 years. (Rick Friedman/The New York Times)
EditorialActor David Corenswet flashes a confident smile and wink just after taking off in a Piper single-prop airplane from Van Nuys Airport in Los Angeles, Nov. 17, 2019. (Michelle Groskopf/The New York Times)