Before the trolls had hair, they were nearly invisible. They were very cute, but they were not particularly interesting. Then a couple of young trolls set out on a quest to cover their heads. Thanks to some very smart teachers and very wise parents, the trolls made a surprising discovery. They put their heads together and showed all their friends how to be the happy-go-lucky, colorfully-haired trolls we know today.What did the wise parents and smart...