Got half an hour to spare? Experiment with motion, physics, and beginner electronics by creating this super cool launcher for paper airplanes. Which plane will fly faster, the one with the heavier nose, or the one with the heavier tail? Which will launch more easily? Junior scientists gain practice testing hypothesis, then tweaking their designs. Spinning motors and disks can launch planes as fast as 50 km/hr, so stand back. Ready for takeoff! (4M, $12.19)