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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Men who kiss their wives in the morning live five years longer than those who don't.
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Speed dating was invented by a Rabbi in 1999.
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Raj from the Big Bang Theory is married to Miss India.
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Historically, sweat has been an active ingredient in perfume and love potions.
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Couples' personalities converge over time to make partners more and more similar.
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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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