Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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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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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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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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Kissing an infection-free partner is good for your teeth!
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Couples' personalities converge over time to make partners more and more similar.
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