Enrico Fermi — "Never underestimate the power of a good approximation."
Never underestimate the power of a good approximation.
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More from Enrico Fermi
"The universe is a strange and wonderful place, and we are only beginning to understand it."
"Don't ever tell anybody anything, or you'll never get anything done."
"I am grateful for the opportunity to have contributed to the advancement of science, and to have witnessed the birth of the atomic age."
"The purpose of science is to make sense of the world, not to explain it away."
"The mind is not a vessel to be filled, but a fire to be kindled."
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Understanding this quote
What it means
Rough estimates and simplified models are genuinely powerful tools for understanding complex problems. Precision isn't always necessary — a well-reasoned approximation can yield accurate insights, guide decisions, and reveal underlying patterns. The skill lies in knowing which details to ignore and which to keep. Approximations aren't intellectual shortcuts born of laziness; they're deliberate, disciplined simplifications that make the intractable tractable and the overwhelming manageable.
Relevance to Enrico Fermi
Fermi was legendary for 'Fermi estimation' — startlingly accurate back-of-envelope calculations with minimal data. He famously estimated the yield of the first atomic bomb test by dropping scraps of paper and measuring their displacement. His design of Chicago Pile-1, the first nuclear reactor, relied on careful approximations about neutron cross-sections before precise measurements existed. He built intuition-first physics into his teaching at the University of Chicago.
The era
Fermi worked during mid-20th century physics' most explosive era — quantum mechanics and nuclear science were rewriting reality faster than mathematical tools could keep pace. During the Manhattan Project (1942–1945), physicists faced urgent problems with incomplete data and no time for exactness. Approximation wasn't optional; it was survival. The Cold War arms race that followed demanded rapid estimation under pressure, cementing the practical value of disciplined rough calculation in science and strategy.
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