Jellyfish as a species are actually older than dinosaurs and sharks.
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More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
Sea otters hold hands while sleeping so they don’t drift away from each other.
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There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
22
The Titanic is about as long as the Empire State building is tall.
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Sharks, like other fish, have their reproductive organs in their chests.
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The Caspian Sea is also classed as the world's largest lake.
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