The original version of this story appeared in Quanta Magazine.
The end is brutal for electrons hurtling at 99.9999999 percent of the speed of light through SLAC National Accelerator Laboratory’s two-mile-long beam pipe: a final slam into End Station A. In the late 1960s and early ’70s, such collisions broke apart protons and neutrons to reveal the elementary particles that make them up. The discovery won the experiment’s leader a Nobel Prize. “End Station A is this hallowed ground at SLAC,” said the physicist Timothy Nelson.
Walking to the back of the warehouse, past piles of equipment, Nelson pointed at the skeleton of an old
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