Richard Feynman — "By the way, Professor, you know that paper in which you say those quantities are…"
By the way, Professor, you know that paper in which you say those quantities are analogous... Did you know they're proportional?
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More from Richard Feynman
"There is no way to learn anything, except by making mistakes."
"The world is a dynamic mess of jiggling things."
"When you are a scientist, you are a child. You are always asking 'Why?'"
"I don't think there's any such thing as a 'best' way to do anything. There's just what works."
"When we know how to do something, we don't call it research anymore."
About Richard Feynman (1918-1988)
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'.
Details
Asking Paul Dirac a question while he was lying on the grass
Date: Unknown, likely during his student years
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Understanding this quote
What it means
The gap between 'analogous' and 'proportional' is the gap between noticing a pattern and finding a law. Analogy is qualitative — a loose structural resemblance. Proportionality is quantitative — one value scales precisely with another. Feynman is casually revealing he found something deeper than what the professor published. The 'by the way' understatement makes the insight land harder: he is not grandstanding, just sharing a more fundamental mathematical truth he happened to uncover.
Relevance to Richard Feynman
This distills Feynman's personality perfectly: irreverent toward authority, obsessed with precision, and utterly casual about profound insights. He famously refused to accept loose explanations and insisted on being able to calculate everything he claimed to understand. His Nobel Prize-winning QED work depended on replacing vague physical intuitions with exact mathematical relationships. The offhand 'by the way' to a professor captures his disregard for academic hierarchy and his habit of finding deeper truths precisely where others stopped looking.
The era
Post-WWII physics in the 1950s and 1960s was the golden age of theoretical physics, when qualitative classical analogies were being systematically replaced by precise quantum mechanical formulations. Feynman worked at Cornell and Caltech during intense paper-publishing and collaborative refinement. Discovering that a claimed analogy was actually a quantitative law mattered enormously — it implied a new conservation principle or fundamental symmetry. The physics community was actively excavating published results to extract deeper mathematical structure from nature.
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