Two in five people in the world marry their first love.
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Historically, sweat has been an active ingredient in perfume and love potions.
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The single biggest predictor of love is proximity.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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'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.
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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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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.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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