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.

随着全球气温上升，许多物种赖以繁殖和狩猎的冰层减少，给本已脆弱的种群带来额外压力。 动物的生存 Antarctica证明了生命在极端条件下的坚韧。从忍受严寒冬风的帝王企鹅到威德尔企鹅 密封件掌握深海潜水的艺术，每个物种都以自己独特的方式适应。