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The Smallest Thing in the Universe Is a Point
The fundamental particles out of which we build our most successful description of nature are points they have zero and don't have any internal structure. They obey equations that describe entities that are singular concentrations of energy momentum angular momentum the things that particles have but localized at individual points. The mathematical structure is only revealed partially in the world because to process the wave function in a way that that accesses information about the precise position of things you have to apply a lot of energy.