Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Sea otters hold hands while sleeping so they don’t drift away from each other.
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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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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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In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
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The single biggest predictor of love is proximity.
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