In a study of professional baseball players from the 1950s,which of the following was associated with their longevity

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Studies have shown that the intensity of smiling in photographs, which is a measure of positive emotion, has been associated with longer life spans, including among professional baseball players. This suggests that psychological factors like happiness and optimism, which can be reflected in a person's smile, may have a significant impact on longevity.

In a Study of Professional Baseball Players from the 1950s,which