Ancient DNA Illuminates the History of Horses in the Americas

Ancient Herpes Viruses Might Have Spread Through Kissing

Stonehenge was likely and ancient solar calendar. According to a new study, a circle of 30 upright "sarsen" stones marked the days each month. Four stones on the outside of the circle tracked leap years. The top of the circle illuminated during summer solstice, and the bottom during winter solstice.

Ancient Europeans farmed dairy—but couldn’t digest milk