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.

话说回来，山东人骨子里的豪爽劲儿，和武术里的侠肝义胆确实有点像。可能是这份热血，让大家误以为山东人都有武术秘籍，随便一翻就能飞檐走壁。

Scientists researching Alpine glaciers store ice in Antarctica. By analysing air bubbles in the ice they may be able to predict the future ...