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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Couples' personalities converge over time to make partners more and more similar.
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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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Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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In 2010, Gary Richmond was beaten into a coma. He woke up with amnesia and no memory of his wife of 20 years. Subsequently, he ended up falling in love with her all over again!
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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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