Coins usually survive in circulation for about 30 years.
66
By peeing in the shower, you can save 1,157 gallons of water a year.
31
The symbol on the 'pound' key (#) is called an octothorpe.
82
Not swinging your arms when you walk increases the effort of walking by 12%, the equivalent of walking 20% faster or carrying a 10 kg backpack.
12
Sunflowers can be used to clean up radioactive waste.
17
In Tokyo, a bicycle is faster than a car for most trips of less than 50 minutes!
58
Any domino can knock over another object up to 1.5x its size. The 32nd object would be big enough to knock over the Empire State Building.
18