there was a species called homohyder berg, and it started to evolve into new species.e mediterranean and europe and asia, in africa it became us. and then we came out, and the big question is what happened when we came out. did we -- >> stephen: we kicked a little ass, didn't we? a little neanderthal ass. >> one view is wement the other species out. but it looks more complicated than that. and it wasn't a complete wipeout as we've learned in the last couple of years. >> stephen: what do you mean? there are no neanderthals left. >> they were into interbreeding. >> stephen: come ocome on. >> and you i have a little neanderthal in us. >> stephen: really? how much? what part of me is neanderthal? is it the guy who comes out when we're drunk? drunk? >> probably, it's in your d.n.a. but it may not be showing physically. >> stephen: is it doing anything in there or is it a sleeper cell, a terrorist d.n.a. sleeper cell? we interbred. >> we did. so basically, we get d.n.a. from the neanderthal fossils and we recreated most of the genome, so comparing that with humans we found p