'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
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
22
There are 2,500,000 rivets in the Eiffel Tower.
98
If you counted 24 hours a day, it would take 31,688 years to reach one trillion!
44
The only king without a moustache in a deck of cards is the king of hearts.
63
A lump of pure gold the size of a matchbox can be flattened into a sheet the size of a tennis court.
140
The sound you hear when you crack your knuckles is actually the sound of nitrogen gas bubbles bursting.
244