YORK, Pa. (AP) - College student Patrick M. Welsh hopped on a midday train to New York City on April 15, relaxed and in good spirits and carrying a backpack. He reached his destination that day, but police know nothing more about his whereabouts since then. Family and friends have not heard from him, and all authorities have to go on is a call made from Welsh's cell phone by a homeless man April 18. Those who know the 22-year-old professional writing major are completely baffled by his disappearance. His close friend said Tuesday that Welsh wasn't the type to...