Re: Does Aikido make you smarter?
Does aikido make you smarter in the common sense understanding of smartness? No.
Does aikido help with skills relating to kinesthetic/spatial abilities that can be included in wider definitions? Probably.
Does it keep you thinking and slow some of the degeneration of aging? It should do.
Does aikido help you to, "learn how to learn", enhancing your ability to pick up other things? It can do, but depends on how you're taught and how you learn naturally.
Can blows to the head and hard ukemi when dehydrated lead to a loss of intelligence? Er...wot, I don't get it.... pass the aspirin.
Personally I think aikido attracts thoughtful people due to its nature. In most cases...