I listened to a Scientific American podcast explaining how the laws of physics impose physical limits on human intelligence. The talk involved neurons, axons and ion channels, mice and cows. One way to increase intelligence, the speaker said, would be to have fatter axons, but that would require consuming more calories. If all it took to be smart was eating too much and having a fat axon, I should be a genius.
But, no. Do you remember a while ago we bought some tie-downs for dummies? We went to the dump again this week, and since we couldn't find them, we had to buy new tie-downs.