When you are looking at someone you love, your pupils dilate, they do the same when you are looking at someone you hate.
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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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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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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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Twenty nine percent of women spend more time shopping for shoes than they do looking for a life long mate.
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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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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