Enrico Fermi — "The bomb will never go off, and I speak as an expert in explosives."
The bomb will never go off, and I speak as an expert in explosives.
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More from Enrico Fermi
"Never underestimate the power of a good approximation."
"The first principle of science is that you must not fool yourself—and you are the easiest person to fool."
"Don't ever do anything that you don't want to explain to a student."
"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."
"I am not a genius. I am just a curious person."
Details
Reportedly said before the Trinity test, though often cited as a humorous or ironic comment given his later actions.
Date: 1945
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Understanding this quote
What it means
When someone with deep expertise declares something impossible with total confidence, they reveal how authority can generate blind spots rather than eliminate them. This captures the dangerous paradox of expert certainty: the more you know, the more convinced you can become—even when catastrophically wrong. It warns that authoritative proclamations, especially about what will never happen, deserve skepticism precisely proportional to how confidently they are delivered.
Relevance to Enrico Fermi
Fermi built the world's first self-sustaining nuclear reactor at Chicago Pile-1 in December 1942 and was a central architect of the Manhattan Project. The irony is crushing: he was literally engineering the explosive device supposedly destined to never detonate. Known for Fermi estimation and preternatural physical intuition, this quote underscores that even the era's greatest experimental physicist was not immune to the trap of confident wrongness.
The era
The 1940s Manhattan Project transformed theoretical physics into military apocalypse under total wartime secrecy. Scientists at Los Alamos, Chicago, and Oak Ridge raced against the fear that Nazi Germany might develop nuclear weapons first. The Trinity test in July 1945, followed by Hiroshima and Nagasaki in August, obliterated any such declarations of impossibility—launching the atomic age and permanently redefining geopolitics, deterrence, and humanity's capacity for self-destruction.
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