Welcome to the Silo...
Thousands of them have lived underground. They've lived there so long, there are only legends about people living anywhere else. Such a life requires rules. Strict rules. There are things that must not be discussed. Like going outside. Never mention you might like going outside.
Or you'll get what you wish for.
"This story is terrific." —BoingBoing.net
"The Wool Omnibus is a great book and deserves recognition as a full fledged contribution to the science fiction genre." —Wired.com