“Neither quarks nor leptons exhibit any structure on a scale of about 10-16 cm, the currently attained resolution. We thus have no experimental reason but tradition to suspect that they are not the ultimate elementary particles. Accordingly, we idealize the quarks and leptons as pointlike particles, remembering that elementarity is subject to experimental test.”

—  Chris Quigg

[Gauge theories of the strong, weak, and electromagnetic interactions, Princeton University Press, 2013, 2, https://books.google.com/books?id=Lt6thfc1gAgC&pg=PA2]

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American physicist 1944

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