Simple science experiments.
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Previously:
https://www.homemadetools.net/forum/...687#post197788
https://www.homemadetools.net/forum/...947#post206952
https://www.homemadetools.net/forum/...331#post215131
https://www.homemadetools.net/forum/...266#post214885
https://www.homemadetools.net/forum/...984#post207117
