ROCK HILL, S.C., April 20 -- Winthrop University issued the following news release: Education Professor Mark Dewalt will lecture on "The Signs and Symbols of Amish Culture" during an April 20 program in Plowden Auditorium. Participants will learn how the Amish lead the nation in sustainable agriculture and about "Going Green" in the 21st century. The Amish are well known for their centuries old farming practices and frugal lifestyle, both of which have interesting corollaries to today's in  more