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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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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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'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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
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40% of people who are rejected in romantic love slip into clinical depression.
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