(1100 words) Waves in Plasmas. I flicked through pages of mind-boggling equations in the heavy hardback book. The Susceptibility and Dielectric Tensors. How the hell could I have understood this stuff? Thirty years later it might as well have been in Chinese! At the sound of muffled hammering, I threw the book back into a box of old textbooks and went out of my storage unit into the corridor. Four units away, a bright light showed under a door. What the hell are they doing in there?