1995
Atomic  


The top quark is found.

Researchers use the Tevatron machine at the Fermi National Accelerator laboratory near Chicago to detect the sixth and last member of the quark family of fundamental particles. Some earlier results from accelerators around the world that led to the development of the standard model for the make-up of matter include the discovery of the muon neutrino (1962), the charmed quark (1974), the tau lepton (1975), and the bottom quark (1977).
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