Cat Parasite Affects Everything We Feel and Do - ABC News
http://a.abcnews.com/Technology/DyeHard/Story?id=2288095&page=1

Don't let the cats get to your head.

Kevin Lafferty is a smart, cautious, thoughtful scientist who doesn't hate cats, but he has put forth a provocative theory that suggests that a clever cat parasite may alter human cultures on a massive scale.

Research has shown that women who are infected with the parasite tend to be warm, outgoing and attentive to others, while infected men tend to be less intelligent and probably a bit boring. But both men and women who are infected are more prone to feeling guilty and insecure.