DETROIT -- The Detroit Institute of Arts is stuck with having to repair a painting worth $1.5 million. It has to remove a stain left by a wad of gum stuck on the painting by a 12-year-old visitor. It happened Friday. Museum officials said the boy was with a group from Holly Academy in Oakland County, Mich., when he took the gum out of his mouth and stuck it on Helen Frankenthaler's 1963 abstract painting "The Bay." The gum didn't stick to the fiber of the canvas, but left a stain the size of a quarter. Museum experts are researching...