The Sahara Desert has not always been the arid, inhospitable landscape we know today. Between 14,500 and 5,000 years ago, the area was unrecognizable, transformed into a lush savannah by an unusually ...

Millennia ago, when ancient people did not know what toothbrushes were, food particles and microbes clung stubbornly to their teeth. These plaques mineralized over time to form crusty, hard tartar.

WASHINGTON (AP) — In the U.S. capital, hundreds of Ethiopians dressed in traditional white shawls chant in the ancient liturgical language of one of the oldest branches of Christianity. During ...

WASHINGTON In the U.S. capital, hundreds of Ethiopians dressed in traditional white shawls chant in the ancient liturgical language of one of the oldest branches of Christianity. During hourslong ...

WASHINGTON (AP) — In the U.S. capital, hundreds of Ethiopians dressed in traditional white shawls chant in the ancient liturgical language of one of the oldest branches of Christianity. During ...

This image provided by William Usaquen and Andrea Casas-Vargas shows the high plains in Bogota, Colombia where a new group of humans lived 6,000 years ago. (William Usaquen, Andrea Casas-Vargas via AP ...