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 ...

北极是一片广阔而冰冷的荒野，是各种野生动物的家园，它们以独特的方式适应了地球上最恶劣的环境之一。尽管条件恶劣，北极仍然养育着种类繁多的生物，从微小的浮游生物到地球上最大的一些捕食者。本文探讨了十种在北极极端栖息地为自己开辟出一片 ...