http://www.msnbc.msn.com/id/43866502/ns/technology_and_science-science/
Dna from neanderthals is now official in humans. 9% of the people from europe, asia, asia minor, america, and australia carry genes from them. More specifically, 1-4% of the genome is from neanderthal. And there is no trace in africans, so contrary to racism and stereotypes and all that bad stuff, keep in mind that neanderthal had inferior intellect to cro-magnon/homo-sapien(which we are directly descended from and currently are respectively).
While logic would have stated there was indeed interracial breeding, there is now official evidence.
And, well... the more you know!