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Archimedes is especially important for his discovery of the relation between the surface and volume of a sphere and its circumscribing cyclinder. He is known for his formulation of a hydrostatic principle (known as Archimedes' principle) and a device for raising water, still used in developing countries, known as the Archimedes screw.
Archimedes
i don't kknow
he discovered a lot helping the world today
An abacus device or board was used for counting numbers in ancient times by civilisations such as the Romans and it's hardly used in todays modern world except in museums, by historians or perhaps in some education establishments.