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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Cows can sleep standing up, but they can only dream lying down.
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Only about 2% of the world population has green eyes.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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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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