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The Trump administration has dismissed the few remaining health officials who oversaw care for some of the world’s most vulnerable people: more than 500,000 children and more than 600,000 pregnant women with H.I.V. in low-income countries. Expert teams that managed programs meant to prevent newborns from acquiring H.I.V. from their mothers and to provide treatment … Read more

Jeremiah Ostriker, an astrophysicist who helped set off a revolution in humankind’s view of the universe, revealing it to be a vaster, darker realm than the one we can see, ruled by invisible forms of matter and energy we still don’t understand, died on Sunday at his home on the Upper West Side of Manhattan. … Read more

For more than a decade, scientists have chased the idea of reviving extinct species, a process sometimes called de-extinction. Now, a company called Colossal Biosciences appears to have done it, or something close, with the dire wolf, a giant, extinct species made famous by the television series “Game of Thrones.” In 2021, a separate team … Read more

A day after attending the funeral of an unvaccinated child who died of measles, Health Secretary Robert F. Kennedy Jr. will kick off a tour through Southwestern states on Monday, spotlighting initiatives that emphasize nutrition and lifestyle choices as tools for combating disease. The Make America Healthy Again tour, which will take Mr. Kennedy through … Read more

Robert F. Kennedy Jr. has spoken of an “existential threat” that he said can destroy the nation. “We have the highest chronic disease burden of any country in the world,” Mr. Kennedy said at a hearing in January before the Senate confirmed him as the secretary of Health and Human Services. And on Monday he … Read more

The assisted-living facility in Edina, Minn., where Jean H. Peters and her siblings moved their mother in 2011, looked lovely. “But then you start uncovering things,” Ms. Peters said. Her mother, Jackie Hourigan, widowed and developing memory problems at 82, too often was still in bed when her children came to see her in mid-morning. … Read more

The measles crisis in West Texas has claimed the life of another child, the second death in an outbreak that has burned through the region and infected dozens of residents in bordering states. The eight-year-old girl died of “measles pulmonary failure” at a hospital in Lubbock, Texas, according to records obtained by The New York … Read more

Two chemical industry groups are asking President Trump for a complete exemption to free their factories from new limits on hazardous air pollution. Under a new rule finalized by the Biden administration last year, chemical plants would soon be required to monitor and reduce emissions of toxic pollutants, like ethylene oxide, a cancer-causing ingredient used … Read more

Congratulations are in order for Mommy, a Galápagos tortoise and a longtime resident of the Philadelphia Zoo, who recently became a first-time mother at the estimated age of 100. Mommy, who has lived at the zoo since 1932, laid 16 eggs in November. Four of them have since hatched — the first successful hatching for … Read more