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 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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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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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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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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