'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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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One in five long-term love relationships began with one or both partners being involved with others.
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The left ear is more responsive to words of love and emotion whispered into it than the right.
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Men fall in love faster than women do.
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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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Parents receive 1 out of every 5 Valentines.
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