Leonardo Da Vinci in his youth could grasp iron door knockers in his large, man-sized hands and crush them with little to no apparent exertion on his part and was known to earn extra money by challenging local tough guys to see who could throw a large rock the furthest.

Even as an older man, Leonardo retained much of the strength he had in his prime and would amuse himself by challenging visitors to attempt to lift large weights scattered around his workshop or by handing them a piece of iron and asking them to try and bend it. When the visitor invariably failed to do the latter, Leonardo would take the iron bar and mould it like soft clay into a decorative shape or simply tie it into a knot. When they failed to do the former, Leonardo would lift the weight with one hand and lightly place it onto a table.

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