Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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40% of people who are rejected in romantic love slip into clinical depression.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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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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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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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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One in five long-term love relationships began with one or both partners being involved with others.
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