Niels Bohr — "Science is not about certainty; it is about uncertainty."
Science is not about certainty; it is about uncertainty.
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More from Niels Bohr
"The goal of science is to make sense of the world, not to explain it away."
"We are all agreed that the only way to escape from the paradoxes of quantum theory is to give up the idea of a 'classical' description of reality."
"Anyone who is not shocked by quantum theory has not understood it."
"The fact that religions can exist, says that there is something in the human mind which is not satisfied by physics."
"The meaning of 'real' is not a fixed one, but depends on the context."
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Understanding this quote
What it means
Science advances by embracing what we don't know, not by claiming final answers. Every discovery opens new questions. Certainty is a trap that stops inquiry; uncertainty is the engine that drives it forward. Genuine scientific thinking means holding conclusions loosely, remaining open to revision, and treating doubt as productive rather than a failure of knowledge.
Relevance to Niels Bohr
Bohr's Copenhagen interpretation of quantum mechanics placed uncertainty at physics' foundation. His principle of complementarity argued that contradictory descriptions can both be true depending on context. He clashed with Einstein precisely over determinism, defending the irreducible probabilistic nature of quantum reality. For Bohr, embracing uncertainty wasn't philosophical humility—it was the correct description of how atoms actually behave.
The era
Bohr worked during quantum mechanics' revolutionary 1920s–1930s birth, when classical Newtonian certainty was collapsing. Einstein's relativity had already shaken absolute space and time. The electron's wave-particle duality, Heisenberg's uncertainty principle, and Schrödinger's equations revealed nature as fundamentally probabilistic. Scientists debated whether physics described reality or merely predicted measurements—a crisis that made uncertainty central to 20th-century scientific identity.
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