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• Learn the science behind the internet sensation， make your own diet soda and Mentos geyser
• Interchangeable caps let you decide what kind of spray you want to make you each time you set off a new geyser
• No more wasting soda trying to get all the Mentos in the bottle at one time， this is a fool-proof method for making a 25-foot geyser
• Comes with a roll of Mentos but you can try other activators to see what works best， it's all part of the science
• Great science fair experiment