Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Your body is creating and killing about 2.4 million red blood cells per second.
17
It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Only about 2% of the world population has green eyes.
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Cows can sleep standing up, but they can only dream lying down.
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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).
12
The 409 escalators in the London subway cover a distance every week which is approximately equivalent to several trips around the globe!
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