In the last 7 years, humanity has discovered 43 potentially habitable planets.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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.
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If you have 1 billion dollars and spend $1,000 every day, it would take you 2,740 years to go broke.
31
A cow produces around 200,000 glasses of milk in her lifetime.
373
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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