HumansDNA from ancient skeletons reveals a lost branch of modern humans DNA from four skeletons found in Cameroon has revealed a mystery branch of early modern humans, suggesting we may need to rethink our species' family tree News
LifeNo more goody two shoes: Why true altruism can’t exist If only the fittest survive, why do good deeds for no return? The enduring mystery of altruism goes to the heart of how evolution does – and doesn't – work Features