When Jim McManus, author of the New York Times best-seller, Positively Fifth Street, read our manuscript, he wrote, Whenever I read something by David, I never fail to learn new things about the world. The book is fantastically illuminating, well written, works as a kind of autobiography, and Al's input is effective as commentary.

You will probably feel the same way by seeing how creatively combining math, logic, psychology, and probability theory can solve problems you might have previously regarded as unsolvable. Your ability to identify and even manipulate other people's thoughts and desires should improve, as well as your ability to understand and resist other experts who attempt to do the same thing. And this book will almost certainly put money in your pocket.

The title, DUCY?, was taken from our forums at twoplustwo.com s. To encourage people to think better, David would often ask, Do you see why? before fully explaining his conclusions or advice. Forum participants created the acronym and started using it themselves, and it became so popular that the following definition now appears in the Urban Dictionary:

Abbreviated form of Do you see why? Commonly used on online forums; originated from the Two Plus Two Poker Community.