Comedy takes center stage in Jamestown, the small western New York city best known as Lucille Ball’s hometown. Visitors celebrate the legacy of laughter and entertainment at the Lucille Ball–Desi Arnaz Museum and the National Comedy Center.   This city of 28,000 residents in pastoral Chautauqua County also has a serious side that often goes unnoticed.   A new film, Nuremberg, is shining a spotlight on Jamestown and the Robert H. Jackson Center. The center commemorates the respected jurist who served as the chief U.S....