The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
The 409 escalators in the London subway cover a distance every week which is approximately equivalent to several trips around the globe!
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
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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Only about 2% of the world population has green eyes.
36
No one knows Albert Einstein's last words. Just before he passed, he spoke several words in German, but his nurse only knew English.
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