'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
Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
88
In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
Wearing red increases attraction.
30
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
Couples' personalities converge over time to make partners more and more similar.
235
When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
130