This article ("the insanity virus") reminds me of taxoplasma gondi and
Greg Cochran's pathogen theory of homosexuality. In this case these
researchers think they've identified the (a?) pathogen responsible for
schizophrenia: HERV-W, also implicated in multiple schlerosis cases.
The background on endogenous retroviruses is interesting too.
Be pretty if you are,
Be witty if you can,
But be cheerful if it kills you.
If you're so evil, eat this kitten!