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About atoms and molecules 582kB, 39 Sek.

" Cervantes,  who lets Sancho Panza lose the darling little donkey on which he rides, but a few chapters later the author has forgotten about it and the dear animal is back again."

"If you finally ask me: Well, what are these corpuscles really, these atoms and molecules? - I must confess honestly i know the answer just as little as I know where Sancho Panza's second donkey came from."

Erwin Schrödinger, 1952
Audio-document from the lecture "Was ist Materie?"
English translation: taken from the article
"Our Conception of Matter"
(in What is Life? and Other Scientific Essays)