Your teeth carry secrets: centuries of history about your ancestors, from where they lived to what they ate and where they traveled. Bioarchaeologist Carolyn Freiwald traces the story of human migration across the Americas -- from Mayan...

If our teeth are made mostly of calcium, why do we use fluoride to keep them healthy? Quick Questions explains why, and how we finally figured it out.

Researchers have discovered a 3,300-year-old baboon skull, believed to be the first clear example of a treasure brought back from the mythical Land of Punt by ancient Egyptians. Chemical analysis suggests the animal originated from a...