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The genomes of monkeys, bats, whales and many other mammals are helping scientists tackle big questions about physiology, evolution and one very famous sled dog.

A rediscovered sample of frozen sediment, collected more than 50 years ago, highlights the vulnerability of Greenland’s ice sheet to a warming climate.

By digging into the geologic record, scientists are learning how wildfires shaped — and were shaped by — climate change long ago.

Could a better understanding of how infants acquire language help us build smarter A.I. models?

Before an observatory can plumb the secrets of the cosmos, it must navigate more humbling challenges.

He had been hailed by Chinese state media as a model for his efforts to promote Beijing’s interests in the United States. He was in fact an F.B.I. informant.

Boris Akunin, the creator of a hugely popular detective series, hopes that fomenting a vibrant Russian culture abroad might undermine President Vladimir V. Putin’s government at home.

As the rebels who ousted Syria’s longtime dictator, Bashar al-Assad, transition from insurgents to administrators, maintaining order in the streets of the capital has become a top priority.

In a series of voice memos sent via WhatsApp, Tasneem Ismael Ahel, 19, described the war unfolding around her in Gaza City.