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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Couples' personalities converge over time to make partners more and more similar.
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When dragonflies mate, their tails form a love heart.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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The single biggest predictor of love is proximity.
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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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