The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
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Your thumb is about the same size as your nose.
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An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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Your body is creating and killing about 2.4 million red blood cells per second.
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The strangers in your dreams are actually people that you've seen in real life.
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