The ATLAS Collaboration observed photons elastically scattering from other photons — an effect predicted by quantum electrodynamics over 80 years ago.
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Klein, S. A clash of photons. Nature Phys 13, 827–828 (2017). https://doi.org/10.1038/nphys4239
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DOI: https://doi.org/10.1038/nphys4239
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