Have you ever thought to yourself, "How do I know that 2+2=4? Why isn't it 2+2+5?" PhD student @kareem_carr talks about numbers and abstraction with @PopMech https://bit.ly/31oFrUT @HarvardGSAS
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I remember back when Popular Mechanics was a good magazine... *NPC.loadingerror.file*
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Don’t worry, once they convince you that everything is practically unknowable. They have a bunch of indisputable facts to fill your head with.
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