PORTLAND, OR — It’s like a scene from some post-apocalyptic atomic nightmare, from some dystopian science fiction film. But this is no cautionary tale of potentially-avoidable future foibles — this is present-day reality, unfolding right this very afternoon, right here in Portland, OR. And it’s coming down on us just days after people in southern states were themselves sprayed en masse from the sky, with a similar [though plasticine] compound.