The Sydney Harbour Bridge is one of the largest steel arch bridges.
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Nothing can travel faster than light in a vacuum.
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The Hawthorne effect suggests behavior changes when observed.
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The phalanx formation required coordination and discipline.
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There are invisible colors humans cannot see.
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Memories are reconstructed each time you recall them.
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Social norms influence everyday behavior.
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The sewing machine sped up clothing production.
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Zhangye once stood along the Silk Road as a trade hub.
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