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.

最近，眼尖的粉丝发现贾斯汀·比伯在Instagram上取关了妻子海莉，引发了分手传闻。在这位《Baby》歌手的震惊举动之后，粉丝们开始问他和这位28岁的模特是否要离婚。 The pop singer has now addressed the ...