Secretary Wayne Clough speaks about his trip to Antarctica

Secretary Clough shows children from the Smithsonian Eary Enrichment Center how penguins in Antarctica propel themselves across the ice. (Photo by Eric Long)

Secretary Clough shows children from the Smithsonian Eary Enrichment Center how penguins in Antarctica propel themselves across the ice. (Photo by Eric Long)

Secretary Clough shows children from the Smithsonian Eary Enrichment Center how penguins in Antarctica propel themselves across the ice. (Photo by Eric Long)

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