The Hoover Dam contains enough concrete to build a two-lane highway from San Francisco to New York City.
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The United Nations was founded in 1945.
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Memories are reconstructed each time you recall them.
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The Roswell incident sparked decades of extraterrestrial speculation.
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There are unanswered questions.
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Memories are reconstructed each time you recall them.
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The credit card simplified cashless transactions.
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Some people have survived being buried alive.
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The Federal Reserve System was established in 1913.
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