As part of their Mind Over Masses television show, National Geographic divided a one block-long sidewalk into two sections; one for cell phone users and the other for those not using a cell phone in ... more 
As part of their Mind Over Masses television show, National Geographic divided a one block-long sidewalk into two sections; one for cell phone users and the other for those not using a cell phone in downtown Washington, Thursday, July 17, 2014. The walkway warnings were put there by the brains behind a National Geographic television show as part of a behavioral science experiment. (AP Photo/Cliff Owen) less 
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Associated Press | Photo By Cliff Owen
Thu, Jul 17, 2014 5:09 PM EDT