A year of mostly bad headlines is almost behind us. ‘Tis the season not to dwell on sorrows, but to remember reasons for gratitude and good cheer. So let us pause to acknowledge those who took steps to reduce nuclear dangers – steps that could yield greater benefits in the years to come. The Arms Control Association has its own list of worthy persons of the year, covering a broad spectrum. Topping my list are the prime movers and shakers in fashioning an agreement rolling back Iran’s capacity to produce fissile material suited for nuclear weapons.