When I was a boy my family had a Time-Life book on the mind which featured a chart of the presumed IQs of famous dead men. Goethe, as I recall, led the pack, at 210. But the Founding Fathers did very well: Benjamin Franklin, Thomas Jefferson and George Washington all scored over 150. As the Fourth of July approaches, we'd do well to remember that the Founders were a smart lot, with few gentleman's C's among them. Yet they didn't know everything. They were strongest in law, political philosophy and history--all essential subjects for revolutionaries and statesmen. But another subject,...