Light particles seen bouncing off each other for first time
CERN physicists have announced the first direct evidence of light interacting with itself at high energy, a rare process where two particles of light called photons bounce off each other. Studying over 4 billion events recorded in 2015, scientists found 13 candidates for light-by-light scattering. Home to the world's largest particle accelerator, CERN confirmed 'God Particle' Higgs boson in 2012.