There are more telephones than people in Washington, D.C.
121
It's impossible to kill yourself by holding your breath.
703
A typical lead pencil can draw a line that is 35 miles long.
158
The chlorine smell in swimming pools is accentuated by the chemical's reaction with impurities (like poop.)
7
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
The best recorded distance for projectile vomiting is 27 feet.
71
Passengers on the Beijing subway can pay with plastic bottles.
29