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And you can actually spread the benefits to others while also benefitting from others. So there's an element of truth to the adage, "Smile and the whole world smiles with you." Known as emotional contagion, it's been proven that if you mimic the facial expression of others, it can actually raise serotonin, dopamine and other "feel-good" indicators. Another professor at the University of Michigan, Christopher Peterson Ph.D., maintains that those who wear their smiles well have a payoff in overall wellness. Dr. Peterson says there is an undeniable link between optimism and a better immune system. A separate study shows that people who were optimistic were less likely to die than those who were pessimistic.
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