A free child outdoors will learn the flat stones the crayfish hide under, the still shady pools where the big trout rest, the rocky slopes where the wild berries grow. They will learn the patterns in the waves, which tree branches will bear their weight, which twigs will catch fire, which plants have thorns. A child in school must learn what a “biome” is, and how to use logarithms to calculate biodiversity. Most of them don’t learn it, of course; most of them have no interest in learning it, and most of those who do forget it the day after the test. Our “standards” proclaim that children will understand the intricate workings of ecosystems, the principles of evolution and adaptation, but one in four will leave school not knowing the earth revolves around the sun.