Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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 1999, a fisherman found a love letter in a bottle from a soldier in WWI. He returned said letter to the now deceased widows 86 year old daughter.
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It's possible to die from a broken heart; it's called Stress Cardiomyopathy.
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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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One in five long-term love relationships began with one or both partners being involved with others.
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40% of people who are rejected in romantic love slip into clinical depression.
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