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25. Einstein recognized that light can act like a particle and named these particles photons
27. Einstein, a German scientist, recognized that energy and mass are equivalent
26. Huygen, a Dutch scientist, debated with Newton about the nature of light; he argued that it was a wave
28. John Dalton, an English scientist, discovered the proton in 1911
29. Max Planck, a German scientist, recognized that light comes in packets of energy that are proportional to the light's frequency
