The Large Hadron Collider restarted after three years of upgrades. | CERN

Two beams of protons zipped around the Large Hadron Collider on Friday, marking the return of the world’s largest particle accelerator after over three years on hiatus. The European Organisation for Nuclear Research, or CERN, spent the past three years doing maintenance work and making major upgrades to the system. Now, the group is preparing to start on a four-year stretch of data collection scientists hope will reveal new secrets of the universe.

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