Quarks appear to be without spatial extent and to lack a deeper structure: they have character without extension and are substance without inside.
The Creation, Chapter 1 (p. 15), W.H. Freeman & Co. 1981
Quarks appear to be without spatial extent and to lack a deeper structure: they have character without extension and are substance without inside.
The Creation, Chapter 1 (p. 15), W.H. Freeman & Co. 1981