Mayor Annise Parker lashed out at an controversial annual study released Monday that placed Houston among the most dangerous cities in the United States with a population of 500,000 or higher. "Crime Rankings 2010-2011," published by CQ Press, ranks Houston's crime as ninth-highest for big cities nationwide, placing it on a list with the likes of Detroit and Columbus, Ohio., although the city has less than half the crimes per capita of those atop the rankings. Violent crime in Houston fell 8 percent during the first half of this year and was on a pace to reach the lowest rate...