Humans left Africa more recently than previously thought
Published on April 4th, 2013 | by Admin0
All of the estimates hinge on one number: the gene mutation rates. By knowing how often genes change, and then counting up the number of genetic differences between different species or groups of people, scientists can create a “molecular clock” to decipher how long ago they shared a common ancestor.
Story: Tia Ghose, LiveScience | Photo: F. Demeter