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Sorry: you checked wrong.

It is a great pity if you are foolish enough to consider Discovery Channel the epitome of genetic science.

a clue for you: Discovery Channel has the execrable habit of making oversimplified overstatements going far beyond what the data will support, purely in the hunt for ratings.

the remains of a woman were found in north africa.
the remains were dated by measuring carbon radioisotope levels. If I recall correctly, the age of the remains was found to be around 20,000 years (that's a bit of an if: been a while since I reviewed the data on this specimen, and my memory is not perfect... however, I am quite certain the date was significantly older than a mere 6,000 years).
the bones contained some mitochondrial DNA fragments.
Some of those fragments are found in the mitochondrial DNA in all modern humans.

now, do you realise that it is entirely possible that this so-called "Eve" had NOT ONE DESCENDANT?

think about it.

HINT1: inheritance of mitochondria is entirely matrilineal
HINT2: mitochondrial DNA mutates very slowly
HINT3: "Eve's" great-great-great-great-great-great-grandmother had the same mitochondrial DNA that "Eve" herself did.

Think about it.
I mean, really, for once on this thread, THINK.