Enrico Fermi — "Oh, anything with a probability of less than 20%."
Oh, anything with a probability of less than 20%.
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More from Enrico Fermi
"It is very hard to be famous and still do good work."
"The atomic age is a new age, and we must learn to live in it."
"The atomic age will either usher in a new era of prosperity, or it will be the end of civilization."
"The most important thing is to never stop questioning."
"The more you know, the more you realize you don't know."
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Understanding this quote
What it means
When asked what qualifies as a miracle, Fermi reduces the question to a threshold: anything with odds below one-in-five. The quote strips mysticism from wonder entirely, treating surprise and the miraculous not as metaphysical categories but statistical ones — events that fall outside what we expect to happen most of the time. Human awe, in Fermi's framing, is simply poor calibration of probability.
Relevance to Enrico Fermi
Fermi was legendary for quantifying the seemingly unquantifiable — his Fermi estimates used rough probability math to reach surprisingly accurate answers. As architect of the first nuclear reactor and a Manhattan Project leader, he worked daily with reaction probabilities and statistical margins. A man who calmly calculated whether the Trinity test might ignite the atmosphere naturally defined miracles in percentages rather than poetry.
The era
In the 1940s and 1950s, quantum mechanics had replaced classical determinism with probability as the fundamental language of physics. Fermi operated in a world where particles had no certain positions, only likelihoods. The Manhattan Project demanded rigorous statistical risk analysis of chain reactions. Scientists were learning that nature itself speaks in probabilities, making Fermi's casual reduction of miracles to a 20% threshold both intellectually honest and perfectly of its time.
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