The Mentos Geyser Tube ($5) is a small clear tube that will help you maximize the effect of the best backyard science experiment ever discovered. Just load the Mentos into the tube, lock it onto your 2-liter of Coke (diet works best), pull the pin and run like hell. The little tube will more than double the normal distance of the soda blast ¡ª be prepared for your fructose fountain to reach 30 feet or more.
