Hi, Neanderthal!

A genetic analysis of nearly 2,000 people from around the world indicates that such extinct species interbred with the ancestors of modern humans twice, leaving their genes within the DNA of people today.

The article is here, including a link to the original research, which is published in the highly reputable Nature.  I am not able to evaluate this result, but it does seem newsworthy and also from a reputable source.  Hat tip goes to the ever-excellent The Browser.

Serious question: even if it is true only probabilistically, should I be happy or sad about this news?