The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
A cow produces around 200,000 glasses of milk in her lifetime.
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Only about 2% of the world population has green eyes.
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Lurch, a Watusi bull, had the largest horns in the world.
32
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
If aliens located 60-65 million light years away from us, looked at earth through a really powerful telescope today, they would see dinosaurs!
18
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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