Photo by Shawn NowlinHigh school students Zoe Prosser and Mady Church holding the pictures of World War 1 Veteran Harry Burke that they helped discover.    Shawn Nowlin shawn.nowlin@ourvalley.org   The word perseverance is defined as “persistence in doing something despite difficulty or delay in achieving success.” Mark Ingerson, a Salem High AP Government and Psychology teacher, says that term is applicable to many of the teenagers he has taught over the last two decades. Two of his students this year, Zoe Prosser and Mady...