Light. Optics specifically. Well, maybe I understand it. I'm pretty good with photons in the near-visible range. Muller matrices, point spread functions, the

Light. Optics specifically. Well, maybe I understand it. I'm pretty good with photons in the near-visible range. Muller matrices, point spread functions, the wave-particle duality, fluorescence, what have you. Though gamma rays and AM radio still confuse me. Ok, I guess I'm still learning then...