How Luban invented the saw？

The saw. Legend has it that when Lu Ban was grabbing hold of tree trunks in order to climb a steep slope while gathering firewood, his hand was cut by a leaf with spiny texture. He then realized that he could turn the leaf's texture into a more efficient tool for tree-cutting, namely the saw.

- "made the south's economy grow rapidly and a small effect that a lot of people don't know is that it made the more demand of slaves and cotton products. and also new states formed due to plantations growing in size."

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mexico south america

explanation: