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.

近日，美国政坛迎来新变动，据美联社报道，克里斯蒂.诺姆（Kristi Noem）在 1 月 25 日经美国参议院投票确认，成为唐纳德.特朗普总统的国土安全部长，并于当日晚宣誓就职。