Does a beam of light, or more specifically, photons, have mass?



If no, then how can gravity affect them.



If yes, then how do they travel at the speed of light? Wouldn't that require infinite energy?





Or maybe I'm just an idiot

 

Wave-particle duality affects photons. They can become electrons.

 

When he's in the water does he get wet, or does the water get him instead? Particle maaaaan.



Light and matter are on the same spectrum. Everything vibrates, just some stuff vibrates faster or slower than other stuff it is easy to confuse, say, people from sounds waves. We don't properly understand light yet, nor gravity. The answer to your question is