How do you become smarter?

For some (birds, at least) it seems the answer is “move higher“.  Researchers at the University of Nevada have studied chickadees on mountains and came to the conclusion that those at higher altitudes – even 600 metres – had larger brains and better spatial recall than those at lower altitudes.

Another reason for those super-cities of the future to be arranged with the high class rulers at the top and the lower classes below perhaps?