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 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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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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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
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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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40% of people who are rejected in romantic love slip into clinical depression.
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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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