New Analysis: All Earth's Peoples Fall Into Just Three Genetic Groups

There is a simplicity and all-inclusiveness to the number three — the triangle, the Holy Trinity, three peas in a pod. So it’s perhaps not surprising that the Family of Man is divided that way, too.

All of Earth’s people, according to a new analysis of the genomes of 53 populations, fall into just three genetic groups. They are the products of the first and most important journey our species made — the walk out of Africa about 70,000 years ago by a small fraction of ancestral Homo sapiens.