When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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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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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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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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