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 ...

（伦敦20日讯）美国第47位总统特朗普就职典礼将在当地时间周一举行，英国首相斯塔默除了致上“最温暖”祝贺，也强调英美关系是“独特的密切关系”，两国曾一同捍卫世界免于暴政，并合作致力实现共同的安全与繁荣。台湾中央社报导，斯塔默指出，数世纪以来，英美关系 ...