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FRANK DEFORD: Maybe it still stings the purists that Richard's contrarian ways worked. The proof is in the pudding. INSKEEP: The proof is in the pudding, he said. Tim Lowe wrote us all the way from Santiago de Cali, Colombia, and he writes the following: Frank, the proof is not in the pudding. It would be a messy, if not completely silly place to keep it.
Electrons were chunks of plum distributed through a positively charged sphere of pudding. In 1911, Ernest Rutherford performed an experiment to test the plum pudding model. He fired energetic a [He 2+ ] particles at a foil, and measured the deflection of the particles as they came out the other side. From this he could deduce information about the structure of the foil.