english: It wasn't Einstein who realized this, it was Karl Schwarzschild who was a German Jew in World War I -- joined the German army already an accomplished scientist, working on the Russian front.
non_english: Nebol to Einstein, kto si to uvedomil, ale bol to Karl Schwarzschild, ktorý bol nemeckým židom v 1. svetovej vojne, Do nemeckej armády vstúpil už ako skvelý vedec a pracoval na ruskom fronte.