Mars had an oxygen-rich atmosphere around 4 billion years ago
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Your body is creating and killing about 2.4 million red blood cells per second.
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Iceland has been so culturally isolated through history since the Vikings, that compared to other Scandinavian counties, people who speak Icelandic can still read the old Norsk sagas.
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Cows can sleep standing up, but they can only dream lying down.
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Only about 2% of the world population has green eyes.
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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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