Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

Last year was the hottest ever recorded: 去年是有记录以来最热的一年： The final blow in a decade of record heat. 创纪录高温十年的最后一击。 We know what ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...