If nothing else, school teaches that there is an answer to every question; only in the real world do young people discover that many aspects of life are uncertain, mysterious, and even unknowable. If you have a chance to play in nature, if you are sprayed by a beetle, if the color of a butterfly's wing comes off on your fingers, if you watch a caterpillar spin its cocoon-- you come away with a sense of mystery and uncertainty. The more you watch, the more mysterious the natural world becomes, and the more you realize how little you know. Along with its beauty, you may also come to experience its fecundity, its wastefulness, aggressiveness, ruthlessness, parasitism, and its violence. These qualities are not well-conveyed in textbooks.