"What came first, the quantum harmonic oscillator or the photon?" If only all problems were that easy. I seriously wonder if my professor is just screwing with me. Same goes for this textbook. I DON'T NEED TO KNOW THE ENTROPY OF THE UNIVERSE TO SHOW WHAT NUMBER OF PHOTONS IN A CAVITY ARE IN EQUILIBRIUM. I'm just going to come back to this later before my brain gives out. B|