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The diet Coke Menthos would be good but it would be too messy as would the volcano. Condustivity of various coins and solutions would be easiest.
The hustle trick would be cool but I'm not so sure they would allow hootch in a 2nd grade class room (here in Tejas, they save that for Jr High).
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Michael D. Holloway
https://simple.m.wikipedia.org/wiki/Michael_D._Holloway
https://5thorderindustry.com/
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