"Electrical matter differs from common matter in this, that the parts of the latter mutually attract, those of the former mutually repel each other."

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In the expressions we adopt to prescribe physical phenomena we necessarily hover between two extremes. We either have to choose a word which implies more than we can prove, or we have to use vague and general terms which hide the essential point, instead of bringing it out. The history of electrical theories furnishes a good example.

— Arthur Schuster