'X' became symbolic for a kiss because in the middle ages when alot of people were illiterate and they used to sign documents with an X and then kiss it for sincerity.
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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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Parents receive 1 out of every 5 Valentines.
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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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When someone looks at a new love, the neural circuits that are usually associated with social judgment are suppressed.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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