You burn 26 calories in a one minute kiss.
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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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In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
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In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81
Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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