Beneath gently rolling hills between the mountains of Switzerland and France, the worlds greatest physics experiment starts its first real run. Two beams of high-energy protons meet head-on at almost the speed of light inside the Large Hadron Collider (LHC), a giant particle accelerator at CERN, Europe's high-energy physics lab. Nanoseconds after the protons crash together, their combined energy gives birth to heavier particles, which decay in an instant into a splatter of lighter debris.
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