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What are quarks made of?
Are quarks and leptons actually fundamental, or are they made up of even more fundamental particles? And is it true that many consider quarks and leptons are so small that they may be thought of as geometrical points in space with no spatial extension at all?
Answer
You have asked the $64K question here so it is hard to give a "real answer" here because I don't think anyone knows the answer. You could almost re-phrase your question and ask "is there a "solid" unitary anything? How can you have something that is not made of something even smaller than itself? Feynman said that nature may be like an onion with an infinite number of layers. You can peel away one layer only to find another layer.
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