Few marine creatures can rival the power and intelligence of killer whales. These highly coordinated hunters have earned their reputation as apex predators, and their ability to take down great white ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient world slept only 6.5 hours a night.