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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Two in five people in the world marry their first love.
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Holding hands with someone you love can alleviate physical pain as well as stress and fear.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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A poll has found that computer 'nerds' make the best lovers, with 82 percent of IT geeks claiming they put their partner's pleasure above their own.
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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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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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