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Learn about rainbows and colors or celebrate St. Patrick's Day with these fun rainbow science experiments for kids.
Elephant toothpaste (really fun foaming science experiment using hydrogen peroxide, dish soap, and yeast!)
Walking Water. I set this up with blue water on the kitchen counter. Sam thought it was cool and would run back to check and see how far it had moved. Jeff came home and was able to explain how it works. It takes a long time though.