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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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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Couples' personalities converge over time to make partners more and more similar.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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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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40% of people who are rejected in romantic love slip into clinical depression.
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