Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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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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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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Two in five people in the world marry their first love.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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