'Jeopardy!' Superstar Pens New Book

Answer: He won 74 Jeopardy games over the course of 6 months.

Who is Ken Jennings?

Jennings blew us away after he was the reigning champ on "Jeopardy!" for half of a year.

Now he's the author of a new book about childhood precautionary tales and the facts behind them in "Because I Said So! The Truth Behind the Myths, Tales, and Warnings Every Generation Passes Down to Its Kids."