The United States and Iran are talking to each other about the elimination of an entire category of weapons of mass destruction. That is a good thing. On the eve of Barack Obama’s inauguration, it shows there is nothing in the DNA of the two nations that precludes dialogue. The discussions – often bruising but never to the point of a breakup – are proceeding within the framework of the Organization for the Prohibition of Chemical Weapons. That’s an unwieldy name for something the world should cheer. The OPCW brings together 185 nations working in near total obscurity toward an April 29, 2012, deadline for the final elimination of the scourge that has brought death and agony from the fields of Flanders in World War I to the Tokyo subway in 1995.