Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Coins usually survive in circulation for about 30 years.
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Sunflowers can be used to clean up radioactive waste.
17
NYC's Metropolitan Transit Authority (MTA) dumps old subway cars into the ocean to serve as artificial reef.
8
Standard paper cannot be folded in half more than 7 times.
232
A fire in Australia has been burning for more than 5,000 years!
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An olive tree can live up to 1,500 years!
58
Stilts were invented by French shepherds who needed a way to get around in wet marshes.
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