By all accounts, the Large Hadron Collider’s first day of bashing protons was a smashing success. The powerful machine at CERN, Europe’s high-energy physics laboratory near Geneva, Switzerland, got off to a rocky start on March 30. But by early afternoon (Geneva time), two 3.5 trillion electron volt beams were colliding head-on.
The collisions in the 27-kilometer-long accelerator set a new record for the highest energy crash of subatomic particles.
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