Researchers have found a link between long thumbs and big brains, suggesting the two features evolved together ...

For years, scientists have puzzled over how Mars lost the thick atmosphere it once had. That atmosphere was essential for liquid water to exist on the planet’s surface, billions of years ago. Today, ...

For citizens of the ancient Roman Empire, a trip to the amphitheater meant a thrilling day of entertainment. However, for many of the gladiators and animals involved, it was a fight for survival. A ...