U.S. first lady Michelle Obama (L) and her Mexican counterpart Margarita Zavala (R) run with second graders during a physical education class as they visit New Hampshire Estates Elementary School May 19, 2010 in Silver Spring, Maryland. The school was awarded the USDA?s Healthier US School Challenge Silver Award in 2009 and partnered with a school in Mexico as part of the Monarch Butterfly Sister School Program. President of Mexico Felipe Calderon is on a state visit to Washington with the first lady of Mexico.
(May 18, 2010 - Source: Alex Wong/Getty Images North America)
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