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The \\u201cMen of Progress\\u201d painting, from 1862, shows the first Secretary of the Smithsonian surrounded by a group of scientists and inventors credited with \\u201caltering the course of contemporary civilization.\\u201d But what may be most remarkable about this tableau is who\\u2019s not there. To mark the 175th\\xa0anniversary of the Smithsonian\\u2019s founding, the National Portrait Gallery\\u2019s\\xa0Portraits\\xa0podcast takes us back in time \\u2013 to trace how the concept of progress has evolved, and who\\xa0current Smithsonian Secretary Lonnie G. Bunch III\\xa0would put in\\xa0his\\xa0\\u201cportrait of progress.\\u201d