Toxoplasma is a protozoan germ that lives in 1 in 4 North Americans. Infected men tend to have lower IQs, slower reflexes and riskier behaviour. In fact, they're almost 3 times more likely to be in a car accident. On the other hand, infected women tend to have higher IQs and be more trusting and outgoing. Unfortunately, it's also been linked to anxiety and depression. You're most likely to get toxoplasma from raw or undercooked meat, and poop from your favourite feline — yes, your cat could be making you crazy!