Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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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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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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Couples' personalities converge over time to make partners more and more similar.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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Raj from the Big Bang Theory is married to Miss India.
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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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