Werner Heisenberg — "I was very much afraid of the consequences of the atom bomb, and I tried to dela…"
I was very much afraid of the consequences of the atom bomb, and I tried to delay its development.
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More from Werner Heisenberg
"The existing scientific concepts cover always only a very limited part of reality, and the other part which has not yet been understood is infinite."
"The problems of language here are really serious. We wish to speak in some way about the structure of the atoms. But we cannot speak about atoms in ordinary language."
"The idea of an objective real world whose smallest parts exist objectively in the same sense as stones or trees exist, independently of whether or not we observe them... is impossible."
"When we speak of a picture of reality, we always mean a classical picture."
"The human mind cannot be content with a description of phenomena; it wants to understand them."
Details
His controversial role in the German nuclear program
Date: Post-WWII interviews/memoirs (e.g., Farm Hall transcripts)
WisdomVerification
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Found in 1 providers: grok
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Understanding this quote
What it means
The speaker admits deep fear about nuclear weapons and claims he deliberately slowed progress toward building one. He is describing a personal moral choice to hesitate rather than race ahead, weighing the destructive power of the technology against the pressure to deliver it. The statement frames scientific work as something the researcher can ethically throttle when the stakes become catastrophic for humanity.
Relevance to Werner Heisenberg
Heisenberg led Nazi Germany's wartime nuclear program, the Uranverein, and after the war insisted he had intentionally stalled a bomb rather than failed to build one. As the founder of quantum mechanics and author of the uncertainty principle, he understood the physics perfectly well, which made his postwar claim of deliberate delay both plausible to some colleagues and fiercely disputed by others, including Allied scientists who interrogated him.
The era
Heisenberg spoke during and after World War II, when Germany, Britain, and the United States raced to weaponize fission. The 1945 Hiroshima and Nagasaki bombings and the subsequent Farm Hall recordings of captured German physicists made his wartime role a global controversy. The early Cold War arms race, Soviet bomb in 1949, and hydrogen bomb tests gave every physicist's wartime choices urgent moral weight and shaped public debate about scientific responsibility.
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