The importance of proper controls (is homosexuality an illness?)
This American Life from Chicago Public Radio has an interesting story about the history of psychiatry with regards to homosexuality: why homosexuality used to be considered a mental illness, and why the psychiatrists changed their mind.
The thing that caught my attention (35 minutes into the show) was the description of an experiment reported by Evelyn Hooker in 1956, testing if homosexual men were maladjusted people. Prior to Hooker's study, medical opinions about homosexuality were based on anecdotal evidence of psychologists who were attempting to "cure" homosexuality:
This procedure…