You may not have it marked on your calendar, but this coming Sunday is "adoption day." It's the day Iran must begin sharply curtailing its nuclear program as part of the landmark nuclear agreement reached this summer.
Nonproliferation experts say the steps Iran is about to take will put it significantly further away from having a nuclear weapon. Critics, however, warn of the possibility of cheating.
Iran doesn't see a need to call attention to adoption day. For Tehran, the point of the nuclear accord is to get out from under an extraordinary web of international economic sanctions.