Hi everybody, At wiki, I was astonished to read this about diffraction of light : "In Quantum Mechanics, it is a remarkable fact that the mechanism of diffraction is based on radiating particles of a medium, while quantum mechanical waves have no transmitting medium. As being part of the Wave-particle duality, this has no physical explanation." Does it mean that diffraction of light, a phenomenon that supports the whole quantum theory, has been left unexplained? There is no mechanical explanation for the change in direction of the light rays on the outskirts of a slit? Isn't that premature to build such a permanent structure on such an unstable ground? Why give it a mainstream status when it can crash anytime?