On September 24th Radiolab posted a new episode, The Fact of the Matter. It included a segment titled Yellow Rain. Radiolab's website says that it's "a detective story from the Cold War, about a mysterious substance that fell from the sky in Southeast Asia at the end of the Vietnam war." Robert Krulwich's interview with two of the segment's guests has prompted outrage at his treatment of them. One of the guests, writer Kao Kalia Yang, talked with Hyphen Magazine.