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Conducting crackpot experiments with everyday items is one of life's great pleasures. When you're ten. If you're still carrying out half-baked 'research' with helium balloons, baking soda and old chemistry sets past the age of fifteen, you really should take a long hard look at yourself.

Mentos Geyser Things You Will Need A roll or box of mentos A 2 liter bottle of diet soda Note: You can use regular soda, but diet soda is easier for cleaning up because it doesn’t have any sugar. Steps: 1. This experiment is probably better done outside on a huge lawn or field, away from crowds, vehicles, or anything that you don’t want covered in soda.