I’ve been baffled by the spread of a non-story over the past couple days, about the supposed discovery of the oldest fossil of our species, doubling the age of our species from 200,000 years to 400,000 years and overturning the generally-accepted idea that Homo sapiens evolved in Africa.

Continue reading “Oldest Homo sapiens fossil? Journalistic vaporware”

As I report in today’s New York Times, scientists have sequenced the full genome from a 50,000-year-old finger bone from a Siberian cave, and they’ve concluded it belonged to a new lineage of humans they call Denisovans. These Denisovans, they argue, share an ancient common ancestor with us that lived, perhaps, 600,000 years ago–long before our species Homo sapiens arose. A couple hundred thousand years later, their branch of hominin evolution split, with one lineage evolving into Neanderthals, and the other into Denisovans. Much later, the Denisovans mated with Homo sapiens expanding out of Africa into southeast Asia, and today their DNA can still be found in the people of New Guinea and neighboring islands.

Continue reading “Denisovans: Ordinary humans with extraordinary genes?”