A pipe 2 feet in diameter will allow four times more fluid to pass through it than a pipe 1 foot in diameter.
20
Passengers on the Beijing subway can pay with plastic bottles.
29
Wearing red increases attraction.
30
Babies are born without knee caps.
78
The symbol on the 'pound' key (#) is called an octothorpe.
82
Dartboards are made out of horsehairs.
129
Only 8% of the world’s currency is physical money. The rest exists only on computers.
20
Play-Doh was first manufactured as a wallpaper cleaner.
122