The London Underground is one of the oldest metro systems in the world.
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Narwhals are known for their long spiral tusks.
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The Inca built extensive road networks across the Andes.
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Nothing can travel faster than light in a vacuum.
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Nothing can travel faster than light in a vacuum.
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Sleep plays a critical role in memory consolidation.
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The Wright brothers achieved powered flight in 1903.
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Nothing can travel faster than light in a vacuum.
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Corvids are known for advanced problem-solving abilities.
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