[Patrick del Poker Grande]

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She loves sports, music and all the normal 12-year stuff

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How about what makes a curveball curve?

I think she could also make something pretty good out of how a guitar/piano string makes different notes. She could build a little something with differing lengths of string/wire and show how each one vibrates at a different frequency. She could have pictures of strings vibrating with different modeshapes and wavelengths. She doesn't necessarily have to know that they're called mode shapes or wavelengths, but the pictures could be cool.