The Panama Canal uses a system of locks to lift ships.
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The use of ultrasound improved prenatal care.
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The Golden Gate Bridge spans the entrance to San Francisco Bay.
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A pangolin protects itself by curling into a tight ball.
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Puppies are born blind and deaf.
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A falcon can dive at extraordinary speeds.
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There are invisible worlds.
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The calculator simplified mathematical computation.
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Some people have survived being buried alive.
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