The first successful powered helicopter flight was by Igor Sikorsky in 1939.
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The phonograph recorded and replayed sound.
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The Suez Canal opened in 1869.
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The Wright brothers achieved powered flight in 1903.
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Sound cannot travel through a vacuum.
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The Ice Age allowed humans to migrate across land bridges.
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The mechanical clock improved timekeeping accuracy.
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Nothing can travel faster than light in a vacuum.
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The Burj Khalifa is the tallest building in the world.
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