In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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Only about 2% of the world population has green eyes.
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There is a mass reservoir of water floating in space that is 100,000 times bigger than our sun and holds 140 trillion times more water than all of our oceans.
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Cows can sleep standing up, but they can only dream lying down.
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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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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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Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
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