Humans all over the place?

More than one species - maybe

It used to be thought that only one species of human existed on the planet at any time, if you accept the recent view that we weren't that separate from Neanderthals.  But the Denisovans and the "hobbits" have rather scrambled things up. Oh, and Neanderthals lived alongside the rest of us longer than we thought.  The director of the Gibraltar Museum, on the island where Neanderthals may have made their last stand, looks at what it all means.