alestStecyC-verTaleLAC.indd 23T 12/16116 3:06 PIA EFTA00286159 238 THE GREATEST STORY EVER TOLD-SO FAR Early in 1973 Gross and his collaborator Giorgio Parisi had completed the first part of the proof, namely that scaling as observed at SLAC im- plied the strong interactions of the proton's constituents mu