The Key to Science, a mini lecture by Richard Feynman

This lecture snippet is really, really good.

The test of theory is observation. Use the theory to predict what happens, and look to see if that happens. If it doesn’t, the theory is wrong. No matter who came up with the theory, no matter their qualifications and credentials, no matter how lovely the math, if theory disagrees with Nature, it is nothing more than pretty math. If the theory’s predictions are observed in Nature, the theory is Not Wrong. Science never proces a theory correct, it just provides a method for weeding out incorrect theories.

Watch the whole thing.

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