Only about 2% of the world population has green eyes.
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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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Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
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An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
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Your thumb is about the same size as your nose.
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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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