Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

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.

野生大自然中的可爱马匹。图片来自那不勒斯。 The animal kingdom is full of incredible surprises. Often, animals demonstrate a level of intelligence and adaptability that rivals, or even eclipses, our own human capabilities.