Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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Couples' personalities converge over time to make partners more and more similar.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
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Historically, sweat has been an active ingredient in perfume and love potions.
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The left ear is more responsive to words of love and emotion whispered into it than the right.
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