What happened when early humans ventured out of Africa and into Asia? Where did they go and whom did they meet along the way? The latest evidence suggests they left far earlier than previously thought and interbred with a newly discovered type of ancient human — the Denisovans, whose existence was established only five years ago when geneticists extracted DNA from a tiny fragment of finger bone. Because our ancestors mated with them, their genes found a home within our DNA. More than that, they’ve helped us survive and thrive.

When Homo sapiens arrived in Australia, they were, for the first time, truly alone, surrounded by wildly different flora and fauna. How did they survive and populate a continent? There is a close cultural and genetic link between the First Australians and modern-day Aborigines. The ancient and modern story intersect here as nowhere else in the world. The secret to this continuity is diversity. Intuitively, they found the right balance between being separate and connected.

When Homo sapiens turned up in prehistoric Europe, they ran into the Neanderthals. The two types of human were similar enough to interbreed — and both created artifacts of similar complexity. But as more and more Homo sapiens moved into Europe, the balance of power shifted. Neanderthals were overwhelmed. Ever since, we’ve had Europe and the rest of the world to ourselves.