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Scientists reflect on the life and work of a researcher whose discoveries made them rethink what it means to be human.

He was the first to use PCR testing on crime-scene DNA, inspiring a practice that has freed thousands of wrongfully convicted people.

President Trump and top health officials announced a deal with Pfizer to try to lower Medicaid prices, and a website to help consumers buy drugs directly from manufacturers.

Her discoveries in the 1960s about how chimpanzees behaved in the wild broke new ground and represented what was called "one of the Western world's great scientific achievements."

A 437-million-year-old fossil from a deposit in Wisconsin could be the oldest species of leech ever found.

Families of people with severe autism say the repeated expansion of the diagnosis pushed them to the sidelines. A new focus on the disorder has opened the way for them to argue their cause.

The E.P.A. plan would allow grocery stores, air-conditioning manufacturers and others to phase out hydrofluorocarbons in cooling equipment more slowly.

The new research provides evidence that Covid reinfections can increase the risk of long-term health consequences.

The discovery of huge petroglyphs of camels and donkeys, as well as hundreds of engraving tools, hints at complex early settlement in the region following the Ice Age.

The administration said the drug company would sell many of its products to the government insurance program for lower-income Americans at prices that align with those in Europe.