The Man Who Taught Himself by Explaining Things Out Loud
How a physicist's informal notebook habit became one of the most cited learning methods in modern education and why it still works six decades later.
There is a notebook in Caltech's archives with a disarming title written on its cover in Feynman's hand: Notebook of Things I Don't Know About. The premise, as he saw it, was both simple and radical. Before claiming to understand something, Feynman insisted on being able to work through it from memory, in plain language, as if explaining it to someone with no background in the subject. Every time the explanation broke down, he knew exactly where the hole in his understanding lived. Then he went back to the source...
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