1964
Atomic  


Quarks are proposed.

Quarks are proposed. The American theorists Murray Gell-Mann & George Zweig independently postulate the existence of quarks, particles with electric charges that are fractions of those of electrons, as the building blocks of protons and neutrons and other strongly interacting particles. This introduces new order into the subatomic world. (Left, artist's fantasy of quarks in a silicon nucleus.)
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