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.
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Men fall in love faster than women do.
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
The single biggest predictor of love is proximity.
30
Two in five people in the world marry their first love.
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Parents receive 1 out of every 5 Valentines.
20
In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
27
In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4