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A chat with aged avatars of future selves can guide people paralyzed by tough decisions. The question is what information to feed the bots.

Scientists have identified four types of black holes, classified mostly by their masses. But these mysterious objects continue to challenge our understanding of the universe.

Prior moon rock samples, including from Apollo, seem heavily influenced by one impact. The farside samples tweak the story.

A few millennia ago, people worldwide may have spoken or signed up to 10 times as many languages as they do today.

This strategy expands orcas' already broad repertoire for dispatching different types of prey.

The object orbits a brown dwarf that orbits a star, and astronomers aren't sure if it's a planet, a moon -- or something else entirely.

A new snake's unique head anatomy suggests early snakes were even more diverse than thought. This one was a rare burrower.

The U.S. hasn't seen measles numbers like this since 1992. An epidemiologist explains what's driving the surge.

Scientists documented humpback whales hunting together at the seafloor, coordinating their arrival to scoop up sand lances.

Humans could learn from chimpanzees and bonobos, who turn to group members for physical comfort during tense moments.