Over a million viewers tune in each week to see what cool science experiment Steve Spangler has up his sleeve. He shoots potatoes, makes toilet paper fly and turns two-liter bottles of soda into giant geysers all in the name of getting people of all ages turned onto science. The now-famous Mentos and Diet Coke experiment turned into one of the most viral marketing campaigns in the history of the Internet. Just drop an unwrapped roll of Mentos into a freshly opened two-liter bottle of soda and the pop becomes a geyser of foam guaranteed to make onlookers cheer wildly and run away. Spangler designed a Mentos-releasing tube so that kids of all ages can make their own Great Geysers without getting soaked. Just load up the tube, stand back and pull out the pin with a string. This set includes more than 15 activities and allows kids to set up their own geyser lab.