Quote:od going back to "Adam" ie the first man, that would be around 40,000 years ago or more.
There was never a single "first man", otherwise we wouldn't be here: the amount inbreeding implied by the existence of a single first male member of our species would have wiped us out in a few hundred years.
We can approximately date back the first man who had a line of male descendants uninterrupted by females, but: a) since people are having children all the time, the identity of the first male with a "line of succession" of only males changes every day (probably even more frequently) and b)even when this man was alive there were many other males, whose descendants at some point had no male offspring.
