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George Zweig and Murray Gell-Man

1964

Suggested the idea of quarks

up, down, or strange,

composed of mesons and baryons,

with spin .5 and the

electric changes of 2/3,

-1/3, and -1/3 respectively

(cc) image by jantik on Flickr

2002 March

2005

2010

2000

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