Iceland's most active volcano, Grimsvotn, began erupting on Saturday, only a year after a towering ash cloud from another of the island's volcanoes wreaked havoc with European air traffic. A geologist with the Icelandic Meteorological Office said Grimsvotn blasted a plume of white smoke 9 miles into the air, but is unlikely to be as severe as last year's eruption. More at BBC News.