Tuesday, June 21, 2011 6:07:47 PM
I do believe scientists discovered we all came from one pair of people located in Africa.
You're probably thinking of the media reporting of "mitochondrial Eve" and "Y-chromosome Adam", which was the usual simplified garbled mess that the media makes of science. The researchers did find strong evidence for a single female ancestor common to all the people tested and a single male ancestor common to all the people tested, but those two probable common ancestors lived tens of thousands of years apart. They weren`t a pair, nor were they the first humans (obviously, living so far apart in time).
Humanity might all trace back to two people and there`s plenty of evidence that humanity started in Africa, probably in the great rift valley and probably somewhere around what`s now Kenya, but it`s not known for sure. It would be a bit unclear anyway, e.g. how do you define the first human as opposed to their very slightly different parents?