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I think I would second the wheel
I'd have to go with the transistor. Without it, we wouldn't be talkling about this here.But then without electricity we wouldn't be using the transitor.
The wheel.Making the link between linear and rotational movements was an astonishing leap of reasoning.Although a number of animals have learned to use tools, possibly including the lever, I don't think any of them have yet discovered the wheel. This isn't to say that animals aren't aware of 'rolling', but they haven't translated it into a tool.