The school shooting in central Sweden's Orebro is the worst mass shooting in the country's history, Swedish Prime Minister Ulf Kristersson said at a press conference late Tuesday. Swedish police ...

地球是一个奇迹物种｜埃及将国家地理中文网设为星标方能收到正常推送这是鬣齿兽科的一个物种，海因里希·哈德在威廉·博尔舍所著的《远古世界的动物》一书中描绘过它。这种已灭绝的掠食者的一块新化石为科学家们提供了有关它的生活方式和捕猎方式的线索。 | ...