EarthHow was Earth's life kindled under a cold sun? An overheated greenhouse, a faster spin, a giant sun, a game of planetary billiards: what explains how Earth got so warm so fast, asks Stuart ClarkFeatures
LifeYour molar roots are leftovers from Homo erectus Our teeth erupt later than they did in our early ancestors, but not so the roots of our molars: they develop as they did in Homo erectusNews