Tom Waes tests whether an existing manual is correct in practice. How smart you are seems a given. You're born with a certain intelligence, and there seems to be little you can do to change that. Yet, there are plenty of guides on the market that claim the opposite. "Test your wisdom," "Brain training," "Pimp your brain"... These are just a few of the dozens of books claiming you can become smarter. Tom will test them once and for all.