A lot of people are bashing this person online but these are awesome questions! Since I have an advanced degree in math, let’s see if I can answer them in 240 characters or less! https://twitter.com/aIeturner/status/1298372968838508546/video/1 …
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The idea that seems obvious to us that you have to keep count of all the money you lose as well as the money you gain -- as opposed to just having a running count of how much money you have -- was legitimately weird and mindbending for ancient peoples
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It ended up becoming the norm across the world because, well, you have to be able to keep track of your debts to have an economy And it's only by generalizing that idea that we slowly got the idea that "negative numbers" were "a thing" in and of themselves
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