Acid rain created by a volcanic eruption caused a devastating mass extinction, leaving the planet teeming with wood-eating fungi, a new study says.

See Bluestonehenge, the newly discovered site that archaeologists say was likely a key stop on the journey to the afterworld—and to Stonehenge itself—for many Stone Age Britons.

A sleek, "ballerina like" cousin of Tyrannosaurus rex has been unearthed in the Gobi desert, a find that reveals fearsome "tyrant lizards" were more diverse than thought.

The newfound "Bluestonehenge" stone circle may have been a ritual pit stop on the road to Stonehenge—and the afterlife.

See the latest, four-winged evidence that birds are dinosaurs in disguise, the guts of Nero's rotating dining room, a new Hubble stunner, and more.

Why don't women know when they're ovulating? Why don't men have clacker-sized testicles? The world's oldest known "human" skeleton—"Ardi"—may hold clues.

There was never a chimp-like missing link between humans and today's apes, says a new fossil-skeleton study that could rewrite evolutionary theory. Said one scientist, "It changes everything."

See images of Ardi, the new human ancestor that could rewrite evolutionary theory. Updated.

There was never a chimp-like missing link between humans and today's apes, says a new fossil-skeleton study that could rewrite evolutionary theory. Said one scientist, "It changes everything."

A new look at holes in a T. rex's jawbone suggests the battle-scarred behemoth was ultimately taken down by a parasite akin to one that infects modern birds, scientists say.

A 23-foot-long behemoth may have been finished off by a gang of sharks 85 million years ago, according to a new analysis of fossil bones studded with shark teeth.

Found by an amateur treasure hunter in England, the largest known Anglo-Saxon gold hoard is rich with precious stones and intricately wrought war gear.

Found by an amateur treasure hunter in England, the largest known Anglo-Saxon gold hoard is rich with precious stones and intricately wrought war gear.

Found by an amateur treasure hunter in England, the largest known Anglo-Saxon gold hoard is rich with precious stones and intricately wrought war gear.

Using astronomy and archaeology, it's possible to calculate the exact day the ancient Egyptians started building the Great Pyramid of Giza, according to controversial new research.