One key contributor to a good immune system is good genes. Lately, researchers have been asking, Where did these "good genes" come from? The answer: sex with Neanderthals.
WASHINGTON -- Were the Neanderthals simply crowded out by the ancestors of modern humans?
That's the theory of a pair of British researchers, who say...
-- In modern times, men explored the New World. But 2 million years earlier, the men among our pre-human forerunners stayed put and it was the women ...