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abacus action adder analog computer Analytical Engine animal arithmetic automatic Babbage Babbage's basic binary code binary number bits body Boolean algebra brain calculating machine called cells central processing unit Charles Babbage circuits clock complex convert counting cybernetic systems cycle decimal Descartes designed developed device digital computer electric electromagnetic electronic endocrine system feedback gate gland Hollerith human Huygens ideas imitate input instructions invented Jacquard Jacquard loom Leibniz living logarithms logic loop magnetic mathematical measure mechanical messages methods movement muscles Napier's Napier's bones nervous system Norbert Wiener number system operations code organized output Pascal's Pascal's calculating pattern principle problems pulses punched cards relay result rotated sense sensors sequence servomechanism signals simple step storage story of cybernetics switch symbols system/3 tables take number Tally sticks temperature tion tool unit wheel William Jevons wire