A newly discovered altar, buried near the center of the ancient Maya city of Tikal, is shedding new light on the 1,600-year-old tensions between Tikal and the central Mexican capital of Teotihuacan.

Virtually everything you will ever encounter reflects a little bit of light, except for one material that seems to swallow ...

Euclid is on a quest to unravel one of the universe’s greatest mysteries: why it's expanding faster and faster. With help ...