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james watt
James Watt FRS, FRSE was a Scottish inventor, mechanical engineer, and chemist who improved on Thomas Newcomen's 1712 Newcomen steam engine with his Watt steam engine in 1776, which was fundamental to the changes brought by the Industrial Revolution in both his native Great Britain and the rest of the world -
karl marx
Karl Marx is best known for his theories that led to the development of Marxism. His ideas also served as the basis for communism. His books, "Das Kapital" and "The Communist Manifesto," formed the basis of Marxism.