A must for projectile motion experiments.  Blow into launcher to send darts up to 25 ft.  Suction cups on darts stick to glass, chalk boards, and walls.  Level the launcher with the bubble level (included) and aim at a wall.  Measure the vertical and horizontal displacements to determine the launching velocity of the dart!  (Hint:  Use a laser pointer to mark the vertical drop.)  Also makes an excellent 'banana' launcher for the 'Feed the Monkey' demonstration (it's more fun to feed the monkey than shoot the monkey!)  Includes five blow darts and bubble level.  Clamp sold separately.