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 ...

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。