Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Only about 2% of the world population has green eyes.
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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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Your body is creating and killing about 2.4 million red blood cells per second.
17
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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