Science Daily has an article highlighting a new technique that seems to allow researchers to home in on specific genes undergoing rapid selection in a given population. If this pans out, it could be useful in determining what sorts of physiological changes humans have undergone in recent millennia, since agriculture, for example. We make a pretty radical assertion in our book about the sorts of changes men's testicles may have undergone recently. This technique might provide a way of confirming or disproving our assertion.