In the last 7 years, humanity has discovered 43 potentially habitable planets.
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The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
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Cows can sleep standing up, but they can only dream lying down.
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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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