This 2011 image provided by Robert Skidmore shows Dr. Elizabeth Stanley, instructing a class of U.S. Marines at Camp Pendleton, Calif. The class was part of an experiment in 2011 in which 160 Camp Pendleton Marines learned to sit and stand during periods of silence and focus their attention on their bodies, breathing and the present moment so their mind could turn down the ongoing chatter about the past and future. (AP Photo/Robert Skidmore)

Associated Press
This 2011 image provided by Robert Skidmore shows Dr. Elizabeth Stanley, instructing a class of U.S. Marines at Camp Pendleton, Calif.  The class was part of an experiment in 2011 in which 160 Camp Pendleton Marines learned to sit and stand during periods of silence and focus their attention on their bodies, breathing and the present moment so their mind could turn down the ongoing chatter about the past and future. (AP Photo/Robert Skidmore)
This 2011 image provided by Robert Skidmore shows Dr. Elizabeth Stanley, instructing a class of U.S. Marines at Camp Pendleton, Calif. The class was part of an experiment in 2011 in which 160 Camp Pendleton Marines learned to sit and stand during periods of silence and focus their attention on their bodies, breathing and the present moment so their mind could turn down the ongoing chatter about the past and future. (AP Photo/Robert Skidmore)
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