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   appear in the universe of   
Doctor Who
The servants of the Dominators
   is described as   
Elementary Particles Subject to the Strong Nuclear Force
Six varieties: up, down, strange, charm, top, bottom
Murray Gell-Mann
(1962) Proposed the existence of fundamental particles that combine to form composite objects such as protons and neutrons. A quark has both an electric and a "strong" charge. Protons and neutrons each contain three quarks.

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