James Randi has escaped from a locked coffin submerged in the sea, and from a straitjacket dangling over Niagara Falls. If you chose a word from a 200-page book, the Canadian native could guess it. Pick an object, he'd make it fade from sight.He gave up performing as The Amazing Randi years ago, but his words to the audience at the end of each show foreshadowed his next act."Everything you have seen here is tricks," he would say. "There is nothing supernatural involved here. I hope you'll accept my word for that. Thank you and good evening."For more than two decades, Randi has been skeptic-in-chief, challenging psychics and faith healers, mediums and mentalists. He finds his targets so preposterous and those falling for them so desperate that he has become obsessed."It's important," he says, "because any misinformation like this – of people claiming they can subvert nature, they can do real miracles and they want to be paid for it ... that's a very negative influence on society."Toronto-born Randall James Hamilton Zwinge's career as a magician and escape artist came after he dropped out of high school and left home to join the carnival. His stage routine gave way to a nagging need to speak out against those whose work he regarded as nonsense – not just people who read palms and minds. Randi "came out" as a skeptic on a 1972 episode of The Tonight Show – he helped Johnny Carson set up Uri Geller, the Israeli performer who claimed to bend spoons with his mind. Randi ensured the spoons and other props were kept from Geller's hands until show time to prevent tampering. The result was an agonizing 22 minutes in which Geller was unable to perform any tricks.In the years since, Randi has garnered a prestigious MacArthur fellowship, established the James Randi Educational Foundation and become guardian of a $1 million (U.S.) prize earmarked for anyone who can prove supernatural powers. It remains unclaimed.Randi will go to great lengths to expose frauds. Michael Shermer, the publisher of Skeptic magazine and executive director of the Skeptics Society, notes he is following in the steps of Houdini."It takes a magician to know how people deceive purposely. Scientists are not trained to detect intentional deception," Shermer says. "If you care about reality, Randi is a lens through which to see how these claims are put to the test."