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Question:

Who invented the toothbrush?

I neeed to know for a school prodject any answers would helpThanks!!!

Answer:

Insulation for what, heating or electricity (or something else)? There's certainly theories for both thermal and electric insulatorsBoth are explained within quantum mechanics, which is hard theory to challenge (if only because it's hard to make sense of it in the first place!)It might be easier to start with 'Drude Theory'.

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