Geologists Discover a Critical Kill Mechanism Behind a 350 Million-Year-Old Series of Extinctions

This 1,000-Year-Old Stone Tablet May've Been a Maya Sports 'Scoreboard'

As syphilis levels hit 70-year high, sexually transmitted infection epidemic shows 'no signs of slowing'

52-Million-Year-Old Bat Skeleton Unveils New Species and Clues to Evolution of Flying Mammals