"Hunt for the Supertwister."
Examining the sun, which is 27 million degrees Fahrenheit.
Scientists examine evidence about Neanderthals that sheds light on the hominids, who died off some 30,000 years ago. See the 2010 reconstruction of the Neanderthal genome, which posits that modern humans and Neanderthals interbred.
The possible motivations of rampage killers.