Nicole Sandler interviewed Dr. Helen Caldicott this morning about what's going on at Fukushima. She tells Sandler Units 1, 2 and 3 have indeed melted down, possibly through the steel core and into the earth, and that reactor No. 4 is "on a knife edge." She says the nuclear power industry is reluctant to help because they don't want people to know just how bad it is.

We don't have a transcript, but it's well worth a listen.