When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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Raj from the Big Bang Theory is married to Miss India.
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Parents receive 1 out of every 5 Valentines.
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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Cuddling (or other ‘love’ acts) helps to heal physical wounds faster due to the release of Oxytocin which is proven to reduce swelling.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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