Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Wearing red increases attraction.
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Historically, sweat has been an active ingredient in perfume and love potions.
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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.
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Couples' personalities converge over time to make partners more and more similar.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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40% of people who are rejected in romantic love slip into clinical depression.
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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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