Has that been solved before?? xD
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To be honest it's a school project so what ever you pick and what ever grade you get doesn't matter. Just choose anything that interests you and apply some science to it (if it's a science fair). A learning fair would indicate it could be for what ever - so yes learning a new musical instrument and documented how you did it, what you learned, how it differed from other instruments you play etc would be acceptable (I assume).
Personally, I like Ancient History.. So I would learn the basics of Hieroglyphs - some simple transliterations and explanations.. examples etc