Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Raj from the Big Bang Theory is married to Miss India.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
When dragonflies mate, their tails form a love heart.
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Two in five people in the world marry their first love.
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40% of people who are rejected in romantic love slip into clinical depression.
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