Scientifically correct? Man descends from one grandfather?

in case this national geographic movie is scientifically correct,
for atheists, this would be a inspiring piece of knowledge (if it is true):
that all men have the same grandfather.
the film deals about a (non-creationist) scientific theory that biologically,
all human are descendants of ONE man, caused by a "bottleneck" in total human population number about 60.000(?) years ago:
http://www.documentarytube.com/the-search-for-adam
skip to part 4+5 if the whole movie is too long for your taste
what do you think?
cheers floyd
for atheists, this would be a inspiring piece of knowledge (if it is true):
that all men have the same grandfather.
the film deals about a (non-creationist) scientific theory that biologically,
all human are descendants of ONE man, caused by a "bottleneck" in total human population number about 60.000(?) years ago:
http://www.documentarytube.com/the-search-for-adam
skip to part 4+5 if the whole movie is too long for your taste
what do you think?
cheers floyd