Only about 2% of the world population has green eyes.
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A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
Cows can sleep standing up, but they can only dream lying down.
745
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Mars had an oxygen-rich atmosphere around 4 billion years ago
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Lurch, a Watusi bull, had the largest horns in the world.
32