When dragonflies mate, their tails form a love heart.
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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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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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Couples' personalities converge over time to make partners more and more similar.
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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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One in five long-term love relationships began with one or both partners being involved with others.
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Men who kiss their wives in the morning live five years longer than those who don't.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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