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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40% of people who are rejected in romantic love slip into clinical depression.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
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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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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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