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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In the last 7 years, humanity has discovered 43 potentially habitable planets.
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The oldest glowing lightbulb was first switched on in 1901 and lives in fire stations in Livermore, CA. It is known as the Centennial Light.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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Cows can sleep standing up, but they can only dream lying down.
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A cow produces around 200,000 glasses of milk in her lifetime.
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Your body is creating and killing about 2.4 million red blood cells per second.
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