Cows can sleep standing up, but they can only dream lying down.
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The strangers in your dreams are actually people that you've seen in real life.
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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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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).
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