The planet's 6.5 billion people are all descended from one ancestor, who lived a few thousand years ago, according to US expert Steve Olson. Olson has created a computer program, which has worked out that we are all descended from just one person, who lived between 5000BC and 1AD.
Saying that we all descended from one person means literally that...it doesn't also mean that there weren't other people around at the same time (which is an easy assumption to make from that statement). What it basically means is that there were a bunch of humans, all mating and producing offspring but due to various factors (environmental and genetic) only those that descended from that "one ancestor" have continued to exist.
More here http://www.wired.com/news/wireservic...?tw=wn_index_5
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