The single biggest predictor of love is proximity.
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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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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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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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One in five long-term love relationships began with one or both partners being involved with others.
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In 2012, a Chinese man named Xiao Fan had a dress made out of 9,999 red roses for his girlfriend and then proposed - 9 in China means forever
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Couples' personalities converge over time to make partners more and more similar.
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40% of people who are rejected in romantic love slip into clinical depression.
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