“In 1929 Oskar Klein stumbled into an apparent paradox when trying to describe the scattering of a relativistic electron by a square potential using Dirac’s wave equation. … In order to capture the essence of the problem without entering into unnecessary complication we will study Klein’s paradox in the context of the Klein– Gordon equation.”

— Luis Álvarez-Gaumé

Source: An Invitation to Quantum Field Theory (2012), Ch. 1 : Why Do We Need Quantum Field Theory After All?

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Luis Álvarez-Gaumé 4

Spanish physicist

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“What will we do when they start capturing our people?" Klein asked. "They will, you know, if they haven't by now. Things go wrong." Heydrich's fingers drummed some more. He didn't worry about the laborers who'd expanded this redoubt- they'd all gone straight to the camps after they did their work. But captured fighters were indeed another story. He sighed. "Things go wrong. Ja. If they didn't, Stalin would be lurking somewhere in the Pripet Marshes, trying to keep his partisans fighting against us. We would've worked Churchill to death in a coal mine." He barked laughter. "The British did some of that for us, when they threw the bastard out of office last month. And we'd be getting ready to fight the Amis on their side of the Atlantic. But… things went wrong." "Yes, sir." After a moment, Klein ventured, "Uh, sir- you didn't answer my question." "Oh. Prisoners." Heydrich had to remind himself what his aide was talking about. "I don't know what to do, Klein, except make sure our people all have cyanide pills." "Some won't have the chance to use them. Some won't have the nerve," Klein said. Not many men had the nerve to tell Reinhard Heydrich the unvarnished truth. Heydrich kept Klein around not least because Klein was one of those men. They were useful to have. Hitler would have done better had he seen that. Heydrich recognized the truth when he heard it now; one more thing Hitler'd had trouble with.”

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Source: An Invitation to Quantum Field Theory (2012), Ch. 1 : Why Do We Need Quantum Field Theory After All?

“Above all, Chopin was the greatest master of counterpoint since Mozart. This will appear paradoxical only if we equate counterpoint with strict fugue, and Chopin wrote no formal fugues except as an academic exercise. His chief training, in both composition and keyboard playing, however, came from a study of Bach, and it was a study that engaged him all his life and which he always recommended to his pupils.”

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Leonid Kantorovich (1912–1986) Russian mathematician

"On one class of functional equations" (1936), as cited in: O'Connor, John J.; Robertson, Edmund F., " Leonid Kantorovich http://www-history.mcs.st-andrews.ac.uk/Biographies/Kantorovich.html", MacTutor History of Mathematics archive, University of St Andrews