What you say is mostly true but you are missing my point. Those who are intellegent are going to get better jobs and a better standard of living, yes. However those who are less intelligent and cant get jobs are still reproducing arguably more than the more intelligent are. They are not dying out due to lack of food, mr & mrs tax payer through the government helps them with that. Darwins theory of evolution requires the strong to survive and the week to die off and not reproduce. In this case for our brains to advance the less intelligent would have to die out and not reproduce, in a modern developed country this is simply not the case.