Classic Science: Water Rocket

Sure it’s educational, teaching things like velocity and pressure, but mostly, this Water Rocket ($6) is just plain fun. You get the rocket, air pump, and fuel feeder in this kit. Set it up right, add some water, and your rocket can soar 100 feet in the air! It shoots the water “fuel” out the bottom to gain altitude so standing under it makes a great way to cool off on a hot day.