Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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A couple had their wedding rings engraved with a waveform of their own voices saying "I do."
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Couples' personalities converge over time to make partners more and more similar.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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Men fall in love faster than women do.
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Speed dating was invented by a Rabbi in 1999.
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