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First Lady Michelle Obama learns about growing mushroom chandeliers from Erika Allen, National Outreach Director for Growing Power, during a tour of Iron Street Farm in Chicago, Ill., Oct. 25, 2011. Sam Kass, White House Assistant Chef and Senior Policy Advisor for Healthy Food Initiatives, left, and Chicago Mayor Rahm Emanuel toured the seven-acre urban farm with Mrs. Obama. October 25, 2011. (Official White House Photo by Lawrence Jackson)