Raj from the Big Bang Theory is married to Miss India.
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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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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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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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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
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