Hi, I'm a high school science teacher. Most textbooks classify EM radiation as kinetic energy. But this doesn't seem right to me. As a photon is massless it's hard to see how it can have kinetic energy which is 1/2 mv^2. It could be said that it has energy hf and therefore mass hf/c^2. Then its kinetic energy would be 1/2 hf/c^2 x c^2, which is 1/2 hf. If its energy is kinetic, then it seems hf = 1/2 hf . . . disproof by contradiction? Or is half of its energy kinetic and half something else? A Higgs boson has an energy/mass of about 127 GeV. This is the case even if it's not moving, so it's not kinetic energy. Is it a separate type of energy (not kinetic or potential) - maybe mass energy or rest-mass energy. If it is, then can a photon (which is also a boson) be energy of the same type?