A 'science' project for US school kids normally involves making a poster of the periodic table, or perhaps torching things with a small gas burner if your science teacher is a bit Walter White. If you're also a cadet with the Civil Aviation Patrol, on the other hand, you can make a computer-controlled, record-breaking paper airplane.
To achieve the record-breaking height (96,563 feet), the students attached their 455g plane to a helium weather balloon, then launched it upwards. Eventually, the balloon burst, the on-board computer (yes, this paper airplane had a computer) severed the tether, and the plane glided 81.9 miles before landing. [Fox Valley Composite Squadron via Gizmag]