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according to me mans best invention is electricity. without electricity we cant imagine our lives. today it is playing a vital role in our lives. we cant do any thing without having electricity today. each and every appliance is running based on this electricity only. now a days each and every home has an inverter and generator.
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Mans best inventin are electronic things and other like wheel The wheel is another invention so ancient that we have no way of knowing who first developed it. The oldest wheel and axle mechanism we've found was near Ljubljana, Slovenia, and dates to roughly 3100 B.C.

Like many of the inventions on this list, the man we believe invented the printing press (Johann Gutenberg in the 1430s) actually improved on pre-existing technologies and made them useful and efficient enough to become popular. The world already had paper and block printing -- the Chinese had them as early as the 11th century -- but the complexity of their language limited popularity. Marco Polo brought the idea to Europe in 1295. 
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