In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
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Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
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8 out of 10 people think that the first kiss indicates how the rest of the relationship will be.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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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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