Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Couples' personalities converge over time to make partners more and more similar.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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40% of people who are rejected in romantic love slip into clinical depression.
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