If Shipman is right, she will have solved one of evolution’s most intriguing mysteries. Modern humans are known to have evolved in Africa. They began to emigrate around 70,000 years ago, reaching Europe 25,000 years later. The continent was then dominated by our evolutionary cousins, the Neanderthals, who had lived there for more than 200,000 years. However, within a few thousand years of our arrival, they disappeared.