Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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The single biggest predictor of love is proximity.
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Couples' personalities converge over time to make partners more and more similar.
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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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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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A poll has found that computer 'nerds' make the best lovers, with 82 percent of IT geeks claiming they put their partner's pleasure above their own.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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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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