Why Are So Few People Left-Handed?

Today marks the 22nd annual International Left-Handers Day. To celebrate, let's look at why only around one in ten people is left-handed. Why, pray tell, are lefties are so rare – or, said another way, why are most of us righties? It seems like a simple question, but it's actually one of the biggest mysteries in all… » 8/13/14 12:20pm 8/13/14 12:20pm

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… » 8/14/12 7:20am 8/14/12 7:20am