Parents receive 1 out of every 5 Valentines.
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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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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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Historically, sweat has been an active ingredient in perfume and love potions.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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