Yesterday, I created a version of this:
But that wasn't the best part. The best part was figuring out that in doing the diet soda/mentos activity, you don't need Mentos. (Diet Dr. Pepper is the most explosive soda, by the way.)
You can use sand. Because it's all about the surface area of the Mentos, and sand has lots of surface area.
But sand is messy, and grinds into your launch tube. So I tried iron filings. I used a magnet to hold them in the tube, and then pulled the magnet away. It was awesome. I'm sure video will follow.
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