The agency’s staff scientists pointed out how Covid was still unpredictable and posed a threat to toddlers, but the official decided to restrict shots only to children with risk factors.
Dr. Vinay Prasad disagreed with staff at the F.D.A., wanting to narrow Covid vaccination approvals to people younger than 65 who have health conditions that put them at risk for severe disease.
A deforested area in Acre State, in western Brazil, in April. For the first half of 2025, officials reported a 27 percent increase in tree loss nationwide compared with the same period last year.
A giant fire last year consumed much of Canada’s Jasper National Park. Canadian scientists leading research into wildfires are using the blaze to learn lessons for the future.
Authoritarians have long feared and suppressed science as a rival for social influence. Experts see President Trump as borrowing some of their tactics.
Chinese research ships are studying the seas for science and resources, but the data they gather could also be useful in a conflict with Taiwan or the United States.
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