Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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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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Sea otters hold hands while sleeping so they don’t drift away from each other.
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In 2010, Gary Richmond was beaten into a coma. He woke up with amnesia and no memory of his wife of 20 years. Subsequently, he ended up falling in love with her all over again!
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Couples' personalities converge over time to make partners more and more similar.
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Erotomania is a type of delusion in which the person believes another person is in love with him/her.
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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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One in five long-term love relationships began with one or both partners being involved with others.
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