Niels Bohr — "It is not the job of science to tell us how the world is, but what we can say ab…"
It is not the job of science to tell us how the world is, but what we can say about it.
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More from Niels Bohr
"Science is not about certainty; it is about uncertainty."
"A physicist is just an atom's way of looking at itself."
"The electron is not a thing but an abstraction."
"Our task is not to penetrate the essence of things, but to develop concepts which allow us to talk in a productive way about phenomena."
"The world is much more complicated than we think, and much simpler than we can imagine."
Details
Similar to his 'Physics is not about how the world is' quote, reflecting his philosophical stance.
Date: Approx. 1930s
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Understanding this quote
What it means
Science does not deliver an unfiltered picture of reality itself. Instead, it gives us reliable statements, predictions, and descriptions about what we observe and measure. The world as it truly is sits behind our experiments, and we only ever access it through the language of models, equations, and repeatable results. Science succeeds when those statements work, not when they claim to expose ultimate truth.
Relevance to Niels Bohr
Bohr built quantum theory around exactly this humility. His atomic model and later complementarity principle held that electrons, waves, and particles cannot be pictured as everyday objects; physicists can only describe what experimental setups reveal. He famously sparred with Einstein, who wanted an objective reality beneath the math, while Bohr insisted physics speaks about measurements, not hidden things-in-themselves. The quote distills his Copenhagen interpretation in one sentence.
The era
Bohr worked through the early twentieth-century quantum revolution, when classical certainty collapsed under radioactivity, relativity, and the uncertainty principle. The 1927 Solvay Conference, the rise of Heisenberg and Schrodinger, and debates over wave-particle duality forced scientists to question whether physics described nature directly or only experiments. World wars, Bohr's escape from occupied Denmark, and the Manhattan Project also pressed scientists to clarify the limits and responsibilities of their knowledge.
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