Modern humans and Neanderthals interbred over a sustained period of around 7000 years, probably in the eastern Mediterranean. That is according to two studies that trace how these two hominins hybridised in unprecedented detail.

“The vast majority of the Neanderthal gene flow… occurred in a single, shared, extended period,” says Priya Moorjani at the University of California, Berkeley.

The studies confirm that modern humans acquired important gene variants by mixing with Neanderthals,…