Sinkholes can form when underground rock dissolves.
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The Rosetta Stone was discovered in 1799.
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Nothing can travel faster than light in a vacuum.
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People often adapt their behavior to fit social contexts.
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Some crabs can live both on land and in water.
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There are invisible worlds.
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Nothing can travel faster than light in a vacuum.
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Raccoons have highly sensitive front paws.
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The first test-tube baby was born in 1978.
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