Hello, I'm quite confused about something. Maybe you all can help :) I'm not sure I understand why the science community seems to assume photons have no mass. I can understand how it wouldn't make sense to say a photon has mass by the mathematics that is used to describe the energy of a particle, because it has no rest mass, but if a positron can interact with an electron and annihilate both particles, creating photons, then if photons have no mass, we have just destroyed mass. And if photons result from 'destroying mass' then shouldn't we also be able to 'create mass' from photons? And in relation to the above paragraph and following from the same train of thought, then since photons travel at a constant speed and can create mass, then wouldn't it be wise to assume a constant mass for photons? Since relativistic mass wouldn't apply because of non-changing speeds. I'm quite confused. Or perhaps the whole concept of mass is flawed to begin with? Or am I not understanding the basics right?