This week brought news of yet another gun massacre in the United States at Washington Navy Yard. It is the latest in a string of 146 mass shootings, with more than 900 victims since 2006. The tragedy gives us pause to reflect on the "common sense" gun controls proposed by president Barack Obama but blocked by gun lobby senators only a few months ago. Among other measures, Obama's proposals sought to reform the national firearm purchase check system, so that offenders... (GunPolicy.org)