'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
255
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
The French named one of their aircraft carriers after Ferdinand Foch, a man who once said "Airplanes are interesting toys but of no military value".
10
No matter its size or thickness, no piece of paper can be folded in half more than 8 times.
-64
The Statue of Liberty is made out of copper. When originally built, it looked like a shiny new penny!
10
There are 635,013,559,599 possible hands in a game of bridge.
39
Oak trees can live 200 or more years.
61
In 1976, an underachieving Princeton junior undergraduate wrote a term paper detailing how to make a nuclear bomb. He got an "A", but never got his paper back because it was seized by the FBI.
16