In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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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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There are so many kinds of apples that if you ate a new one everyday, it would take over 20 years to try them all.
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Lurch, a Watusi bull, had the largest horns in the world.
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Cows can sleep standing up, but they can only dream lying down.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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