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http://www.theatlantic.com/daily-dish/archive/2007/08/why-people-stand-on-the-escalator/225970/
Copyright © 2012 by The Atlantic Monthly Group. All Rights Reserved.
This article available online at:
http://www.theatlantic.com/daily-dish/archive/2007/08/why-people-stand-on-the-escalator/225970/