Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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'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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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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Wearing red increases attraction.
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Men who kiss their wives in the morning live five years longer than those who don't.
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Two in five people in the world marry their first love.
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