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The goal of tossing an airplane is to get it to glide smoothly and gently, flying straight or in a gradual curve.
Ken Blackburn, shown here, must have the knack: From 1983 to 1996, he held the Guiness World Record for time aloft for paper airplanes. In 1998, he regained the record with a 27.6-second flight.
Look at these three photographs, and see if you can work out how he uses his arms and body to give the paper plane the best flight possible.