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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Raj from the Big Bang Theory is married to Miss India.
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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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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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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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