Only about 2% of the world population has green eyes.
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A cow produces around 200,000 glasses of milk in her lifetime.
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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 oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
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The University of Oxford (teaching since 1096) predates the Aztec empire (1428 - 1521).
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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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Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
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