World Changers, an intense, hands-on missions experience for students sponsored and managed by the North American Mission Board (NAMB), will mark a number of key milestones this summer, not the least of which is its 20th anniversary. World Changers launched its first fledgling community project in Briceville, Tenn., near Knoxville, back in 1990. Between June 7 and July 31, the…