In their final moments, the last protons flew at nearly the speed of light. They completed the 27-kilometer loop underneath the Alpine countryside 11,245 times a second until they were released from their metal coil and slammed into a giant steel-coated graphite block. Since December 2018, other than a few tests here and there, the Large Hadron Collider (LHC) has been offline. But on April 22 the LHC fired up again and commenced its third run.
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