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The clever part of the wheel is the axle. Seeing a stone rolling down a hill might lead to rolling a load on logs for transport.

Funfact: the first wheels were potter's wheels. https://www.smithsonianmag.com/science-nature/a-salute-to-th...

My favourite early invention is cloth. Fire's not really an "invention" in the same sense, more like taming wolves and horses.



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