2) I'd be very cautious about interpreting causality, even if the results are true. Beauty is influenced by environmental factors (diet, exercise, health care etc.) that are correlated with parental and own-income. Some of these same factors also influence intelligence. There's a decent chance this research boils down to "being poor sucks."
IQ also correlates with diet, exercise, and health care.
PS: It's not that these things boost IQ or Beauty. Instead it's their lack is what reduces attractiveness and IQ. Basically, take an IQ test while tired, sick, and starving and you will do worse. Also, the average young, healthy, and physically fit person is reasonably attractive.
http://www.stat.columbia.edu/~gelman/research/published/kana...
2) I'd be very cautious about interpreting causality, even if the results are true. Beauty is influenced by environmental factors (diet, exercise, health care etc.) that are correlated with parental and own-income. Some of these same factors also influence intelligence. There's a decent chance this research boils down to "being poor sucks."