Feb. 5 (UPI) -- A 1915 silent film about Abraham Lincoln was thought to be lost forever before being found in a warehouse on New York's Long Island. Dan Martin, a summer intern at Historic Films Archive in Greenport, was sorting through boxes of donations at the archive's warehouse last summer when he found the only known surviving copy of The Heart of Lincoln , a silent film about the life of President Abraham Lincoln. "For someone going to school for film preservation, this is about the most