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Here are a whole bunch of science demonstrations aimed at the lower grades. The presenters are very dynamic and obviously enjoy showing off their ways of demonstrating the concepts of science that they are teaching.
It’s hard to argue with the impact on students of a great science demonstration. I’ve had students come back years later, saying, ” I don’t remember all that much physics, but I sure remember the tennis ball that you shot out of the cannon.” At least they got something from my class.