A new experiment at the Large Hadron Collider has confirmed one of the oldest predictions in quantum physics.

Physicists from the ATLAS experiment at CERN have revealed they’ve observed direct evidence of a process known as light-by-light scattering, in which light interacts with itself at high energy.

This phenomenon is critical to current understanding of quantum electrodynamics, and scientists have sought this ‘milestone result’ for decades – but now, for the first time, researchers say have evidence of photons that interact and change directions.

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