The strangers in your dreams are actually people that you've seen in real life.
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Cows can sleep standing up, but they can only dream lying down.
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A cow produces around 200,000 glasses of milk in her lifetime.
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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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Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
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