Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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Couples' personalities converge over time to make partners more and more similar.
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One in five long-term love relationships began with one or both partners being involved with others.
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You burn 26 calories in a one minute kiss.
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