The Eiffel Tower grows about 6 inches taller in summer due to thermal expansion of metal.
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The piano was originally called the 'gravicembalo col piano e forte' (harpsichord with soft and loud) by its inventor.
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Steel was a rare luxury material in the ancient world — mass production became possible only in the 19th century.
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Morse code was originally developed for electric telegraphs, not radio.
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GPS exists because of Einstein’s theory of relativity correcting time differences.
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Maglev trains use superconducting magnets to levitate above the track, eliminating friction and enabling 600+ km/h speeds.
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The microwave oven was invented accidentally when Percy Spencer noticed a radar magnetron melted a chocolate bar in his pocket.
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The credit card simplified cashless transactions.
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The steam engine powered early industrial machinery.
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