Arre, try the "Effect of Temperature on Magnetic Strength" project—heating and cooling different magnets while measuring their pull with a spring balance. It’s solid physics, not too common, and the setup is manageable. I say this because in my first year of engineering, we did a similar experiment with ferrite and neodymium magnets, and I was surprised how much a little heat could weaken what seemed so permanent. My old guitar's warped neck actually taught me how temperature changes materials!
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