In high school, I had learned this thing, Coulomb's law, that the force would go along that line between it. But what was so interesting to me in Purcell is that he said, that follows from the symmetry of space. That's a property about space, because if you imagine those two particles by themselves in an empty universe, otherwise empty, there is no other preferred direction than this line between them. So it has to be along that line. And whether you believe that argument or not, I just was entranced by the idea that you could make an argument like that.

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