Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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The single biggest predictor of love is proximity.
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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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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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