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 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.
25
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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The left ear is more responsive to words of love and emotion whispered into it than the right.
44
Couples' personalities converge over time to make partners more and more similar.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
165
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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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14