Impatient hedge-fund billionaires do not attempt to conceal their contempt for the rest of us. They are used to making money—fast. Witness what they have done to large segments of the overall economy. Education does not thrive in those conditions, because there is no standard of perfection in any schoolhouse that can survive brutal suppression of uniformity imposed by clumsy testing. A successful school not only makes room for dissent. It constantly nourishes it.