Eh, that's not what I took away from the article. 1) People who feel dissatisfied with their lives or are from broken homes are likely to reach out and join a

Eh, that's not what I took away from the article. 1) People who feel dissatisfied with their lives or are from broken homes are likely to reach out and join a social club 2) People with high IQ are eligible to join MENSA The fallacy is thinking that MENSA is made up of a representative sample of group 2, but really it is made up mostly of people who fit criteria 1 AND 2. Therefore, any studies of mental health of group 2 by sampling MENSA members would be flawed since you're oversampling people from group 1.