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He experimented with pulleys, by which he demonstrated his famous leverage principle, “that with any given force it was possible to lift any given weight.” This enabled him to stage one of his most famous coups de théâtre in front of King Hiero and the entire city of Syracuse. Archimedes tied a series of pulleys to a dry-docked three-masted ship loaded with cargo and passengers, and then, to the crowd’s stunned amazement, he lifted it into the harbor by himself. This led Hiero to declare, “From this day forward, Archimedes is believed no matter what he says,” which led Archimedes to reply in the full flush of triumph, “Give me a lever and a place to stand, and I shall move the earth.
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Arthur Herman (The Cave and the Light: Plato Versus Aristotle, and the Struggle for the Soul of Western Civilization)