Our proposition that the physicists on both sides should not advance the production of atomic bombs, was thus indirectly, if one wants to exaggerate the point, a proposition in favor of Hitler.
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"I was very much afraid of the consequences of the atom bomb, and I tried to delay its development."
"It is not surprising that our language should be incapable of describing the processes occurring within the atoms, for, as has been remarked, it was invented to describe the experiences of daily life,…"
"One can't say that one could equally well say that's the quickest way of ending the war."
"Quantum theory does not really describe the behavior of 'things'; it describes the behavior of 'what we can know' about things."
"An expert is someone who knows some of the worst mistakes that can be made in his subject and how to avoid them."
From a letter to Robert Jungk, reflecting on the unintended consequences of their wartime discussions about atomic weapons.
Date: November 17, 1956
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Heisenberg admits a painful irony: if scientists on both sides had agreed to halt atomic bomb research, the side already holding power at that moment would have kept its advantage. A mutual freeze sounds morally clean, but in wartime it effectively preserves the status quo. Refusing to build a weapon is not neutral when your enemy is a dictator; restraint by both camps helps whoever is currently winning.
Heisenberg led Nazi Germany's nuclear program and spent decades defending his role, claiming he deliberately slowed the project. This quote shows his tortured postwar reasoning: the physicist who formulated uncertainty wrestled with moral uncertainty too. His 1941 Copenhagen meeting with Bohr, his internment at Farm Hall, and his self-justifying memoirs all circle this same dilemma—whether scientific restraint served conscience or, inadvertently, tyranny.
Heisenberg lived through Weimar collapse, Nazi rule, WWII, and the Cold War's nuclear shadow. Physicists worldwide faced an unprecedented question: should they build weapons capable of erasing cities? The Manhattan Project succeeded; the German Uranverein did not. After Hiroshima, scientists like Oppenheimer, Bohr, and Heisenberg publicly reckoned with their complicity, launching debates about arms control, Pugwash conferences, and the moral responsibility of researchers that still shape science policy today.
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