5 ways to think yourself well

September 13, 2014 12:24 PM

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(CNN) -- There wasn't anything that could bring singer Pharrell Williams down in his hit song "Happy." Turns out he was on to something.

Being happy and optimistic can prolong your life, help you manage stress, lower your risk of death from cardiovascular disease and even help protect you from the common cold, according to the Mayo Clinic.

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