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May 4, 2019
… saved Do All Types of Lights Follow Ohm's Law? at 6:52 p.m.
… saved Investigation of Semiconductors at 6:51 p.m.
… saved Investigating Batteries: Building an Electrolytic Cell at 6:38 p.m.
… saved The Optimal Bottle Rocket Lauch at 12:48 p.m.