Jellyfish as a species are actually older than dinosaurs and sharks.
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Two dogs were among the Titanic survivors.
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In 1992, 29,000 rubber ducks washed off a ship. They were found thousands of miles away 8 years later.
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The North Atlantic gets 2.5 centimetres (1in) wider every year.
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The Titanic is about as long as the Empire State building is tall.
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The Caspian Sea is also classed as the world's largest lake.
52
NYC's Metropolitan Transit Authority (MTA) dumps old subway cars into the ocean to serve as artificial reef.
8
Sharks, like other fish, have their reproductive organs in their chests.
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