白宫星期五(1月31日)表示，从星期六开始，唐纳德·特朗普(Donald Trump)总统将对来自加拿大和墨西哥的进口产品征收25%的关税，对来自中国的货物征收10%的关税。但是，白宫没有说明对这些有可能造成美国消费者物价迅速上升的措施是否有任何豁免 ...

Memorials for victims of American Airlines plane crash displayed in Massachusetts, U.S.

U.S. President Donald Trump said on social media Friday that the Black Hawk helicopter was "flying too high" when it collided with a passenger jet that was approaching the runway at the Reagan ...

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.