Human-made ivory and stone tools have been found in a 14,000-year-old layer of Alaskan earth, providing evidence of some of ...

Archaeological sites older than the Roman Empire and the pyramids can be found in many US states. These sites shed light on the first humans who arrived in North America. Some are closed to the public ...

(Santa Barbara, Calif.) — Researchers continue to build on a body of evidence for a fragmented comet that is thought to have exploded over the Earth almost 13,000 years ago, which may have had a role ...