Recent research strikes a blow to the theory that humans and Neanderthals interbred. THE GIST Studies over the last two years suggest that Neanderthals vanished more than 30,000 years ago. This would mean that early humans and Neanderthals could not have interbred. enlarge Over the last two years, several studies have suggested that Homo sapiens got it on with Neanderthals, an hominid who lived in parts of Europe, Central Asia and the Middle East for up to 300,000 years but vanished more than 30,000 years ago. The evidence for this comes from fossil DNA, which shows that on average Eurasians...