The Compton scattering effect (1923) seems to be the main evidence that light has a particle-like behavior. What are the other effects that indicate that light has a particle-like behavior? If there are no other effects that indicate that light has a particle-like behavior, and if we find an alternate explanation for the observed Compton scattering effect, then we would have eliminated the wave-particle duality of light. Andrew Gray has commented that the Compton scattering effect can be explained as a (relativistic) Doppler effect on a wave. If Compton scattering can be explained this way, and there is no other evidence for the particle nature, then we can focus on the wave nature of light, and eliminate the dichotomy.