The Hoover Dam contains enough concrete to build a two-lane highway from San Francisco to New York City.
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Satellites can read license plates from orbit under ideal conditions.
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The light bulb made electric lighting widely practical.
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The Chunnel carries both passenger and freight trains.
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The first domain name ever registered was symbolics.com, in 1985.
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The original name for the search engine Google was 'BackRub.'
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The steam locomotive expanded rail travel.
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The transistor revolutionized modern electronics.
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The development of MRI technology improved internal imaging.
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