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In Search of the Ultimate Building Blocks by Gerard 't Hooft

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22 Grand unification

When in 1931 Paul Dirac concluded from his equation for the electron that there should exist an antiparticle with opposite electric charge, he felt very embarrassed. Such a particle had not yet been discovered, and he really did not want to disturb the scientific community with such a revolutionary proposition. ‘Maybe this strange positively charged particle is simply the proton,’ he suggested. When shortly after that the real antiparticle of the electron (the positron) was identified, he was so surprised that he exclaimed: ‘My equation is smarter than its inventor!’

Nowadays, physicists no longer suffer from such modesty. High energy physicists are now accused of arrogance, and not fully without reason: when the new gauge ...

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