We are all born pig-ignorant. Upon having accumulated a lifetime of knowledge, we all promptly die. Ignorant babies replace learned elders. Knowledge is a depleting resource; ignorance is renewable. Yes, libraries and data banks grow, but knowledge finally has to exist in the minds of living people to be effective and evolve; unread books, unseen videos, and un-accessed hard drives are inert. They are also subject to destruction by teeth of time: fire, flood, mildew, and moth, as well as that modern bookworm, the computer virus.