Book excerpt: The craze in positive thinking that swept American culture thanks to celebrity endorsements from such popular figures as Oprah Winfrey comes from the page to the screen with The Secret. Derived from a tradition said to date back hundreds of years, the philosophy of The Secret is believed to help people reach their goals and lead happier lives, with a technique for thinking and doing that's been employed by some of history's most accomplished people. ~ Cammila Collar, Rovi