... to ashes from an extinguished fire, to draw his geometric figures. Never giving up an opportunity to ponder his work, after bathing and anointing himself with olive oil, he would trace figures in the oil on his own skin. One famous story was when Hiero ordered a gold crown from the goldsmith and gave the goldsmith the exact amount of gold to make ... . Based on the principle of the pulley along with other scientific theories he constructed catapults capable of hurling giant rocks at approaching troops. Another siege weapon constructed by Archimedes was an invention known as "Archimedes' ...

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