Enrico Fermi — "It is not enough to know how to build a bomb. One must also know how to control …"
It is not enough to know how to build a bomb. One must also know how to control it.
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More from Enrico Fermi
"The universe is not only stranger than we imagine, it is stranger than we can imagine."
"I have always believed that physics should be simple and beautiful."
"We are like children who have found a new toy. We do not know what to do with it, but we are playing with it."
"The only way to learn physics is to do physics."
"Don't ever do a calculation without knowing the answer."
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Understanding this quote
What it means
Technical mastery of a powerful force is necessary but insufficient. True responsibility demands the ability to govern what you create—through safety systems, policies, ethics, and restraint. Whether applied to nuclear weapons, artificial intelligence, or any transformative technology, the principle holds: capability without control is dangerous. The wisdom to limit, regulate, and direct power matters as much as the knowledge to generate it.
Relevance to Enrico Fermi
Fermi built Chicago Pile-1 in 1942—the world's first self-sustaining nuclear chain reaction—then worked at Los Alamos on the Manhattan Project and witnessed the Trinity test. Having personally unlocked fission's destructive potential, he understood that physics outpaced governance. He later co-authored a minority advisory report opposing the hydrogen bomb on ethical grounds, embodying this tension between scientific knowledge and responsible restraint.
The era
The atomic bombings of Hiroshima and Nagasaki in 1945 proved nuclear weapons could annihilate cities instantly. The Soviet Union detonated its first bomb in 1949, igniting a Cold War arms race with no clear endpoint. Scientists who built these weapons suddenly faced urgent questions about proliferation and existential risk. The Atomic Energy Act and early arms-control debates reflected a civilization scrambling to govern what it had unleashed.
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