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Sun Melted recycled crayons ~ I am going to try using the cookie cutters in the oven instead of a mold. I have tons of cookie cutters. On the next hot day I will try using solar power to do the melting!
Solar Energy, easy basics to help convince people to join the fun. I have not checked the statements for accuracy. But in general, the benefits are evident.
Elephant toothpaste (really fun foaming science experiment using hydrogen peroxide, dish soap, and yeast!)