The halting problem — determining whether a program will ever stop — is mathematically unsolvable, proved by Alan Turing.
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Petra in Jordan was carved into rose-colored rock cliffs.
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The phonograph recorded and replayed sound.
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The Inca built extensive road systems across the Andes.
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Sleep plays a critical role in memory consolidation.
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Nothing can travel faster than light in a vacuum.
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A falcon can dive at speeds over 200 mph.
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Some crabs can live both on land and in water.
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The Wright brothers achieved powered flight in 1903.
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