“Mom! I tested a theory! If you rub a beer bottle cap on the tile floor really hard, it creates friction and you can feel the heat.”
From the mouth of my unschooled 7 year old
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That’s great! Now, did the beer bottle cap leave scratches on the tile floor?
@tridentinefan – I don’t think so. It might have scratched the layer of dirt off, though. 😉