http://www.bbc.co.uk/sn/prehistoric_life...man1.shtml
i think that was it
or they all simply interbread whcih lead to us. it sounds a hell of a lot simpler.
and leaves less questions
the simplest of answers is uaually the correct one, and anything that leaves more questions than answers is only a theory that can be filled with more theory.
Theoretical science is probably the most fascinating of them all.
i would pretty much bet my life that we all have atleast some part of the neandethal genetic code.