- 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
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