Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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Couples' personalities converge over time to make partners more and more similar.
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Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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When dragonflies mate, their tails form a love heart.
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People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
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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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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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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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