Dudley Riggs didn't have to run away from home to join the circus. Home was the circus. Son of the acclaimed aerial flyers Riggs and Riggs, he made his circus debut as a polar prince parading in a wagon pulled by a polar bear. At the age of five, he graduated to a risqué vaudeville act during the circus off- season; at eight, he outgrew his cutes (and his child stardom) and joined his high-flying parents on the trapeze. Eventually he had to learn...