When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
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Gary Kremen, founder of match.com, lost his girlfriend to a man she met on match.com.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Yawns are more contagious among people with closer relationships.
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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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40% of people who are rejected in romantic love slip into clinical depression.
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