I posted the following elsewhere back in 2008 .... it fits well enough into this blog so lets bring that content over here...
Old news: I believe in Environmental Adaptation and Darwinism. Every changing (not just living) thing is a product of its environment. This applies to memes, software constructs, world religions, and cyclones.
If people are too smart to think with their gonads, they have fewer babies. This is counter productive. This is a feedback mechanism that limits the evolution of human intelligence.
The twist: If we improve education to make people behave in a way smarter than their genetics, breeding will naturally dumb down the population.