A famous study of 180 American catholic nuns found a positive relationship between optimism and life expectancy.
What is life expectancy?
Life expectancy is the average rate of the person's death, or it is said that the life expectancy is the numbers of year an average person live. For example, life expectancy is the of the people is 70 years, but some of the people will die below 70 years and some of the people die above of 70 years.
Thus, it is optimism
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