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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'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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Couples' personalities converge over time to make partners more and more similar.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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The average person will go on a date at least 100 times before they finally marry.
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Speed dating was invented by a Rabbi in 1999.
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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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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