The principle of science, the definition, almost, is the following: The test of all knowledge is experiment. Experiment is the sole judge of scientific truth.
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"The great thing about science is that it's a way of not fooling yourself."
"The easiest way to fool yourself is to believe something because you want it to be true."
"I don't care what you think. I care what's true."
"I don't have to be polite when I'm doing science."
"I have no idea where I'm going. I have no idea where I'm going to be. So it's probably best that I don't know."
American theoretical physicist who shared the 1965 Nobel for QED, developed Feynman diagrams, and wrote the Feynman Lectures on Physics. Closely associated with Julian Schwinger (co-Nobelist for QED) and Murray Gell-Mann (Caltech rival and Eightfold-Way physicist). For an intellectual contrast, see Deepak Chopra, physician and quantum-mysticism author — Feynman's Caltech 'cargo cult science' commencement address is the precise template for what he saw as misuse of physics terminology — Chopra-style appropriation of quantum vocabulary for metaphysical claims is the canonical example of what Feynman called 'fooling yourself'.
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Knowledge claims in science must be verified through physical testing and observation. No matter how elegant a theory or how prestigious its author, if experimental results contradict it, the theory is wrong. Reality, not human authority or logical elegance alone, is the ultimate arbiter of what is true about the natural world.
Feynman built his career dismantling untested assumptions. His work on quantum electrodynamics required extraordinary mathematical precision verified against experiment to extraordinary decimal accuracy. He famously exposed the Challenger disaster by dipping an O-ring in ice water — a simple experiment overriding institutional consensus. Empirical humility was not just his philosophy but his daily practice.
Feynman articulated this during the postwar scientific boom when theoretical physics risked becoming detached from experiment. Cold War funding pressures incentivized grand unified theories, string-theory precursors, and prestige-driven speculation. His insistence on experimental grounding was a pointed corrective, anticipating later critiques of unfalsifiable physics that would dominate late 20th-century theoretical science.
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