See these guides for ideas, there might be something in there?https://www.instructables.com/id/Science_Fair_Projects/https://www.instructables.com/id/Fun_Science/L
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Check out Bernoulli's principle. It explains how airplanes fly, how a carburetor works, how a perfume atomizer works, how a sailboat tacks into the wind, why a flag ripples in the wind, and how a curve ball is thrown. Set up some hands-on demonstrations people can manipulate.