'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
A sneeze travels out your mouth at over 100 m.p.h.!
29
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
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
The chlorine smell in swimming pools is accentuated by the chemical's reaction with impurities (like poop.)
7
There are 635,013,559,599 possible hands in a game of bridge.
39
The longest Monopoly game in history lasted 70 straight days.
124