help me lrn2physics

Hey /sci/,

How the hell can something be massless? Someone told me that light is a massless energy particle or some shit like that but that can't be possible because in order for something to actually exist, it must be made of something, and that something has to have mass, regardless of how minute it is right? Or is this correct since light is suppose to have duality? Please edumacate me.

>>45
You're nuts.

Photons interact only with leptons, quarks, and W bosons (and gravitons, but standard model can't account for gravity).  None of these things can accelerate a photon in the classical sense.  I think the most they can do is absorb and emit photons.