Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Wearing red increases attraction.
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Couples' personalities converge over time to make partners more and more similar.
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