Speaking of Karl Schwarzschild, here's an interesting tidbit that, in my experience, few non-German speakers know: The literal translation of "Schwarzschild" (

Speaking of Karl Schwarzschild, here's an interesting tidbit that, in my experience, few non-German speakers know: The literal translation of "Schwarzschild" (or "schwarzer Schild") to English would be "black shield". So him discovering the first black hole spacetime was certainly very appropriate! :) (Similarly, I was very happy when I first heard about the Poynting vector [0] which, roughly speaking, indicates the direction in which an electromagnetic wave travels.) [0] https://en.wikipedia.org/wiki/Poynting_vector https://en.wikipedia.org/wiki/Poynting_vector