Grist: More than 70 years ago, a chemical attack was launched against Washington state and Nevada. It poisoned people, animals, everything that grew, breathed air, and drank water. The Marshall Islands were also struck. This formerly pristine Pacific atoll was branded the most contaminated place in the world. As their cancers developed, the victims of atomic testing and nuclear weapons development got a name: downwinders. What marked their tragedy was the darkness in which they were kept about what was...