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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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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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The left ear is more responsive to words of love and emotion whispered into it than the right.
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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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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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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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