Quarks were discovered inside protons and neutrons in the early 1970s, and it is suggested by some theorists that they might themselves contain particles known as ‘preons’. The idea wasn’t entirely unrealistic, but raised further questions, as-yet-unanswered; it is our understanding and that of most physicists that quarks, electrons and all other particles are best described as being vibrations of ‘superstrings’. The best way to describe superstrings is as multi-dimensional entities far smaller than the smallest sub-atomic particle.
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