Animal trials took place across Europe from the Late Middle Ages until the end of the 18th century. In this excerpt from ...

A genomic study of Greenland sharks, thought to be the longest-lived vertebrates on the planet, is hinting at the secrets to ...

Over a century after a red-lined cave wall was discovered, scientists have determined that it represents the U.K.'s oldest ...

A 2015 astronaut photo shows dark-orange water that appears to bleed across the bright-white floor of a high-altitude salt ...

NASA has confirmed that a bright fireball meteor exploded in the sky over New England on Saturday (May 30), releasing the equivalent energy of about 230 tons of TNT and generating a sonic boom heard ...

China just launched its rival to SpaceX's Falcon 9 rocket for the first time, reportedly without providing any advance safety warnings. The 236-foot-tall (72 meters) March 12B rocket blasted off at ...

The Euphrates River fueled the "cradle of civilization," and a new study reveals the waterway was born of two other ancient ...

The Colosseum was the largest amphitheater built in ancient Rome. The massive arena held thousands of spectators, who packed the stands to watch gladiators battle to the death and fight exotic animals ...

The Gessel gold hoard is among the largest treasures ever discovered in prehistoric Europe but has only three pieces of ...

A child's 4,000-year-old skull found in Uzbekistan has signs of trepanation, making it the oldest evidence of surgery in ...

Earth's current largest ocean, the Pacific, blankets more than 30% of the planet's surface, stretching 12,000 miles (19,000 kilometers) at its widest point, between Colombia and the Malay Peninsula, ...

The grandfather paradox is a self-contradictory situation that arises in some time travel scenarios that is illustrated by the impossible scenario in which a person travels back in time only to kill ...