Enrico Fermi — "I hope it works."
I hope it works.
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More from Enrico Fermi
"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."
"The universe is not only stranger than we imagine, it is stranger than we can imagine."
"Don't ever do anything that you don't want to explain to a student."
"The history of science is full of examples of people who thought they knew everything, and then discovered that they knew very little."
"It is not good to try to stop knowledge from going forward. Ignorance is never better than knowledge."
Details
Said to Leo Szilard just before the Chicago Pile-1 went critical, referring to the nuclear chain reaction.
Date: 1942
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Understanding this quote
What it means
Even the most prepared person faces a moment where calculation ends and reality begins. This phrase captures the honest uncertainty between theory and outcome—acknowledging that effort and expertise don't guarantee results. It's not defeatism; it's intellectual honesty. The speaker has done everything possible and now surrenders to the test itself. Hope here isn't wishful thinking—it's the last honest word before the unknown answers back.
Relevance to Enrico Fermi
Fermi built Chicago Pile-1 beneath the University of Chicago's Stagg Field stands in December 1942—the first human-made self-sustaining nuclear chain reaction. Despite being arguably the era's greatest experimental physicist, no one had ever done this before. Fermi's entire career balanced rigorous mathematics with hands-on experiment. This quote perfectly reflects his empiricist core: you calculate everything, then you find out if reality agrees.
The era
December 1942, mid-World War II: Fermi's team achieved the first controlled nuclear fission chain reaction while Nazi Germany raced toward the same goal. The Manhattan Project was accelerating, the atomic bomb was theoretical, and the geopolitical stakes were civilization-scale. Scientific success here wasn't abstract—it would reshape warfare, international power, and human existence permanently. The gap between 'we think it works' and 'it works' had never carried higher consequences.
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