Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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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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Couples' personalities converge over time to make partners more and more similar.
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Men fall in love faster than women do.
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Raj from the Big Bang Theory is married to Miss India.
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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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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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