In fact, I believe this approach works out nicely. Although neanderthal
"men" existed long before 6000 years ago, the first civilizations (I am
thinking here of Sumer) begain just about 6000 years ago. If we assume that
the "creation" of Adam involved breathing a soul into some proto-human
(i.e. neanderthal) being, then the nefesh of Adam gives him qualities which
are uniquely human, i.e. building cities, and written and spoken
communication. Well, about 6000 years ago is when the first cities and
written languages appear...
Food for thought.
Jonathan Katz frisch1@mit.edu