Eve Conant

The DNA in this ancient Siberian leg bone shows that the man had Neanderthal ancestors — yet more proof that humans and Neanderthals interbred. And he lived much farther north than expected.

Ebola has rightly gripped the world's attention, but its death toll pales in comparison to other infectious diseases like tuberculosis. TB is the world's second leading infectious killer, after HIV/AIDS, and it's claiming more victims than previously thought — 1.5 million last year alone — according to a report released ...