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.

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

黄石国家公园。图片由 Kerry 通过 Pexels 提供。 当冬季冰雪覆盖美国时，许多动物开始采取一种非凡的生存策略：冬眠。当食物来源稀缺且气温下降时，这种类似深度睡眠的状态可以让动物保存能量。让我们来探索十种在美国冬季冬眠的迷人动物。 黑熊躲在高高 ...