JACKSON, Wyo. (AP) -- Procter & Gamble Co. agreed to air a disclaimer in a Metamucil commercial featuring Old Faithful to mollify the National Park Service. Created last year, the commercial features a Yellowstone National Park ranger pouring a glass of Metamucil into the geyser to help it stay regular. The commercial sparked criticism from the Park Service, which said the park's geothermal features can be damaged by dumping things into them, and venturing near geysers and hot springs can be dangerous. Although Procter & Gamble said most TV viewers would realize the commercial was a joke, it agreed to...