He found, using fifty stones to keep track, that he could easily remember the names of all fifty states, and he knew the capitols of a lot of them. He knew his times tables all the way up to twelves, and he knew when they'd signed the Declaration of Independence and when John Glenn landed on the moon. But he was keenly aware that he didn't know how to tell if nuts were good to eat, or what berries will make you sick, or what mushrooms were poisonous, and he slowly began to wonder why not one person had ever taught him anything useful.