I agree.
I don't know when levers were first used - as long as sticks I suspect - but I can't believe my 400x gt grandfather in the Neolithic was too stupid to do so - and to figure it out for himself, not be taught. You don't have to work on a farm for long to find yourself picking up stuff to shift heavy stuff with, it just occurs to you if you've got any spatial awareness. If you tread on a flat stone and it happens to rock and shift another bigger one you've got it, it sinks in and you know all the Newton you need.
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