Quarks and the Scale of Things

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While we know for sure that quarks and electrons are smaller than 10 (-18) meters, it is possible that they have no size at all. It is also possible that quarks and electrons are not fundamental but are composites of more fundamental particles. (Yikes! Will it never end?)

In summary, we know that atoms are made of protons, neutrons, and electrons. Protons and neutrons are made of quarks, which are possibly made of more fundamental particles...
...but, we hope not.