Einstein, my upset stomach hates your theory [of General Relativity]—it almost hates you yourself! How am I to' provide for my students? What am… — Paul Ehrenfest Copy Share Image
“If you [Robert Oppenheimer] intend to mount heavy mathematical artillery again during your coming year in Europe, I would ask you not only not… — Paul Ehrenfest Copy Share Image
Don't be impatient with me. Bear in mind that I hop around among all of you big beasts like a harmless and helpless frog… — Paul Ehrenfest Copy Share Image
No two electrons in the same state? That is why atoms are so unnecessarily big, and why metal and stone are so bulky. — Paul Ehrenfest Copy Share Image
A thesis has to be presentable... but don't attach too much importance to it. If you do succeed in the sciences, you will do… — Paul Ehrenfest Copy Share Image