Defenders of an ice-free inland passage for early Americans make their case.
Preschoolers wait longer for extra treats than they used to. What does it mean?
Researchers are using smartphones to tap into the ups and downs of suicidal thinking that occur over hours and days, hoping to help prevent suicides.
A wild bull and symbolic designs were imprinted on the bodies of two Egyptians at least 5,000 years ago.
Short, REM-heavy sleep bouts separate humans from other primates, scientists find. Sleeping on the ground may have a lot to do with it.
Ancient humans’ close relatives also created rock art and shell ornaments, studies assert.