Mars had an oxygen-rich atmosphere around 4 billion years ago
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A cow produces around 200,000 glasses of milk in her lifetime.
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The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
3
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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