Testicles

There is a funny yet interesting article over at Discover magazine about the positioning of the testicles and why they aren't protected a wee bit more.
Here's a little sampler:

The site of human testicles seems a bizarre anomaly from an evolutionary point of view, like positioning the driver of an armored vehicle in a sack strapped to the bumper. If the whole point of the human organism is to pass on genes, why put the repository of those precious genes out front, in harm's way? Why not protect them the way the brain and the heart are protected, with thick bone vaults and, in the brain's case, an elaborate barrier to bloodborne infection?