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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Cows can sleep standing up, but they can only dream lying down.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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Your thumb is about the same size as your nose.
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Only about 2% of the world population has green eyes.
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The oldest glowing lightbulb was first switched on in 1901 and lives in fire stations in Livermore, CA. It is known as the Centennial Light.
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