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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You burn 26 calories in a one minute kiss.
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In 1999, a fisherman found a love letter in a bottle from a soldier in WWI. He returned said letter to the now deceased widows 86 year old daughter.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
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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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