/u/OceansOnPluto's posts
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In modern times, we have the expectation that technology will be completely different in 30 years, and will change how we live in minor (and sometimes major) ways. When did this idea start?
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The 3 divisibility rule is if you add up the digits of any number, and the sum you get is divisible why 3, then the larger number is too. Why is this?
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When did societies in antiquity change over from the barter system to the monetary system? Do we know of the earliest civilization to use money instead of strict bartering?
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