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Richard Feynman - The.Character.of.Physical.Law - Part 2 (full version)
Tinkerin' Thinkers
Part 2 of Richard Feynman's Messenger Lectures at Cornell, The Character of Physical Law, on the relation of mathematics to physics. He explains why understanding nature requires mathematics.
Recommended as a lecture so clear that no formal training is needed to follow it, and cited on why math is needed for physics.
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