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Principle of the Shortest Time/Fermat/"Knowledge"/Feynman: how does light know which path to take?
Important: there is an area near the optimum point where, in the first approximation, there is no significant change in time. But there is in second order.
Feynman: this is not about causality!
In fact, the light decides! It practically smells the right path.
This is related to the wavelength.
Knowledge/Saying/Language/Uncertainty Principle/Feynman: that we cannot precisely measure place and impulse does not mean a priori that we cannot talk about it. It just means we do not need to talk about it!
Knowledge/Atoms/Atomism/Feynman: if all physical knowledge were destroyed and only one insight was preserved, the thesis that everything is made of atoms would be the most important one.
Vom Wesen physikalischer Gesetze München 1993
Vorlesungen über Physik I München 2001