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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clue for "PHOTONS"

PHOTONS: Particles in physics; Particles that have been teleported in real life (!); Radiation particles; Particles of light; Massless light particles; Light particles; Quantum light particles; Electromagnetic energy units; Light intensity units; Gamma rays, essentially