Ancient humans may not have interbred with Neanderthals, after all

If you hail from outside of Africa, there's a decent chance that you share as much as 4% of your DNA with a long-extinct lineage of Neanderthals. Many scientists agree that this small percentage of shared genetic information is evidence that humans and Neanderthals interbred with one another in Europe tens of thousands … » 8/14/12 7:20am 8/14/12 7:20am

Genetic evidence reveals that polar bears originally came from Ireland

Every polar bear alive today shares a common maternal ancestor, and it isn't even a bear from the same species. Their mitochondrial DNA reveals a 100,000 year story of interbreeding and hybridization...and the story is far from over. » 7/07/11 2:00pm 7/07/11 2:00pm