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    From James Gleick’s bio of Feynman - this was his favorite results in mathematics (when he was a teenager, he might have developed more refined tastes later).

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      the whole concept of “forget what you know about numbers and instead picture addition and multiplication as moving and stretching a number line” thing seems too wacky for me to be able to get a handle on the rest of the video

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        Since I’m a dummy, I find a much clearer explanation on this other video: e to the pi i for dummies. YouTube recommended me that one after seeing 3Blue1Brown’s video.