Before modern humans emerged, there were many other human species competing for resources. Proto-humans evolved into archaic humans, which were then replaced by early modern humans. How many human species were there? It’s hard to know for certain, because all we have are fragmentary remains. But here’s what scientists know about some of our ancestors: | Sunday Roast

Even archaic humans had their preferences. A recent study of genetic material from three female Neanderthal specimens suggests that female Homo sapiens and male Neanderthals mated more often than the other way around, and thus shaped humanity. | Graveyard Shift