Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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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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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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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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For Valentine's Day 2014, an unnamed man sabotaged a special screening of "Beijing Love Story" at a Shanghai cinema by booking every other seat, subsequently preventing couples from sitting together.
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