Aerial photograph of the 3. Stanford Linear Accel- erator Center (SLAC), California. The end at which the electrons start their journey is in the distance; the experimental areas where the accelerated electrons are smashed into targets, or used for further acceleration in electron-positron colliders, is at lower centre. The giant red- roofed building in the experimental area is End Station A, where the first evidence of quarks was discovered in 1968-72. The service road looping around in the foreground marks the position of the underground PEP electron-positron collider.
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