Most people know it as nature vs. nurture.
Until science began its epic quest to unravel the human genome, behavior genetics had to rely mainly on observational research. But a new tool kit of more precise experimental techniques using both mice and men has shown conclusively that a huge array of behavior and personality traits is heavily influenced by genes. Research on identical twins reared apart, meanwhile, has become a living laboratory for nature vs. nurture in which separated twins are reunited later in life and discover remarkable similarities. All this is the promising subject matter of these books. You hear rumblings that some scientists question the findings, but it's not in context and the topic seems to go away.