Tae Kwon Do is only around 60 years old.
64
No matter its size or thickness, no piece of paper can be folded in half more than 8 times.
-64
The key to happiness is spending your money on experiences rather than possessions, according to studies.
21
Since 1982, a radio frequency emanating from Russia has been broadcasting a buzzer-like sound and, periodically, an unknown voice reads orders, names, and numbers. No one knows where exactly it is coming from or what it means.
13
You can start a fire with ice.
367
A quarter has 119 grooves on its edge, a dime has one less groove!
34
The chills you sometimes feel when listening to music is called "musical frisson."
18
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240