The cola+Mentos trick is up there with corn starch+water (vibrating platter optional) in scientific coolness out of common kitchen supplies.

"Diet Coke+Mentos", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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The cola+Mentos trick is up there with corn starch+water (vibrating platter optional) in scientific coolness out of common kitchen supplies.