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Wingsuit flying is a dangerous sport that becomes even more hazardous when the adrenaline junkies who love it decide to compete with each other. Every October, these Rocky the Squirrel impressionists flock to China's Hunan Province for the World Wingsuit Grand Prix. Flyers launch themselves from the top of Tianmen Mountain, descend 5,000 feet, make a loop-d-loop, glide three-fourths of a mile, and parachute to the finish line, where glory (and medics) wait.