In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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The single biggest predictor of love is proximity.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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Two in five people in the world marry their first love.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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