'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
On average, the life span of an American dollar bill is eighteen months.
33
It's impossible to kill yourself by holding your breath.
22
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
80% of millionaires drive used cars.
68
On average people fear spiders more than they do death.
447
The weight of air in a milk glass is about the same as the weight of one aspirin tablet.
63
Each year, more than 50,000 people are injured by jewelry in the U.S.
29