As for reviving neanderthals no way. That would be an ethical nightmare all round. And this from someone who thinks the development of artificial conscious minds is a good idea. I don't remember the title, but awhile back Azimov did a short story that included the bringing of a neanderthal baby to modern times via a time machine and the ethical implications.
"The Ugly Little Boy" -- T. Michael Keesey The Dinosauricon: http://dino.lm.com Parry & Carney: http://parryandcarney.com