Shawn Achor, a best-selling author of The Happiness Advantage and corporate speaker, talks to Marines of I Marine Expeditionary Force (MEF) Information Group, I MEF, at Marine Corps Base Camp Pendleton, California, Jan. 6, 2020. Achor spoke about the scientific link between happiness and productivity and discussed methods the Marines can use to increase their positive mindset while under stress. ( Marine Corps photo by Cpl. L. Ruth Wheeley)

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