how did we discover agriculture many times in different parts of the world all at the same time?
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We didn’t! “Agriculture” was developed slowly, over a period of thousands of years, independently in different regions, and progressing at different rates depending on the natural resources that were available to be exploited. The relativity of it being so long ago means that we can often feel like, for example, 8000 years ago and 5000 years ago were “roughly the same time”, when they were as far apart from each other as we are today from the Trojan war.
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