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# What did Archimedes invent?

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Regarded as one of the greatest mathematicians of all time, Archimedes invented a method known as Archimedes’ principle. It is a method used for determining the volume of an asymmetrical object. Archimedes of Syracuse was a mathematician, inventor and engineer from Ancient Greece.

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Archimedes' principle states that a solid body immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced by the object. In other words, if the weight of the water displaced is less than the weight of the object, the object will sink. If not, the object will float, with the weight of the displaced water equal to the weight of the object.

One of his well-known inventions was the Archimedes’ screw. This device had a revolving screw-shaped blade inside a cylinder, and it could be turned by hand or by a windmill. This device is still used today for pumping liquids and granulated solids such as grain and coal. In some developing nations, this device is often used for irrigating agricultural fields.

The Archimedes claw was another of Archimedes' inventions. It was a weapon designed to defend the city of Syracuse and was also known as the "ship shaker." The claw consisted of a crane-like arm from which a metal grappling hook was suspended.

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Archimedes discovered many math and science concepts, including the Archimedes Screw and siege engines. Much of his work contributed to the development of later ideas such as hydrostatics, levers and many math concepts.

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Louis Braille created the Braille system in 1824 after trying to improve upon the method being used at the time. Braille began to create his system while studying at the National Institute for Blind Youth.

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In 1620, during a period of time known as the Scientific Revolution, Sir Francis Bacon helped develop a method of testing the truthfulness in knowledge. This method involved testing hypotheses by manipulating nature in an effort to rule out faulty knowledge garnered from perception alone.