I think there is a rather simple way to invent a cart in one go (incl. wheel and axle): (1) You role something heavy on tree trunks. (2) You understand that you don't need the part in the middle that only adds friction and carve that out. ...
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(3) You try to fix this to a board so the trunks cannot roll away. (4) You build it from different parts instead of carving it out of one trunk. (5) You make the parts lighter by taking more and more away and building them from smaller parts. ...
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