Who were the Neanderthals? Even for archaeologists working at the trowel’s edge of contemporary science, it can be hard to see Neanderthals as anything more than intriguing abstractions, mixed up with the likes of mammoths, woolly rhinos and sabre-toothed cats. But they were certainly here: squinting against sunrises, sucking lungfuls of air, leaving footprints behind in the mud, sand and snow. Crouching to dig in a cave or rock-shelter, I’ve often wondered what it would be like to watch history rewind, and see the empty spaces leap with shifting, living shadows: to collapse time, reach out, and allow my skin to graze the warmth of a Neanderthal body, squatting right there beside me.