Preschoolers are just plain fun. They know enough about life to enjoy it with enthusiasm and gusto, but not enough to survive very long without supervision. They are an independent lot, but would never want to be left home alone. They live on praise and encouragement, but a single stern look could bring them to tears. They can be shy and timid one moment, yet confidently insist "I can do it!" the next. They possess a ferocious appetite for play and...