Time magazine published an article in March suggesting that Type A people, tend to have more children (11% more for males, and 19% for females) than their more passive peers.  Looks like another piece of the evolutionary puzzle that explains why certain behaviors such as leadership and decisiveness are considered sexier & more desirable.  Here’s another reason to be an Alpha Male or Female, leave more decedents.  The meek will not likely inherit the earth.  Instead they’ll be outnumbered & out bred by the aggressive.