The Secret Number on the Back of a $5 Bill

On the occasion of his retirement as cohost of Radiolab, Robert sat down with Jad to reflect on his long and storied career in radio and television, and their work together over the past decade and a half. And we pay tribute to Robert, inspired by a peculiar tradition of his.

This episode was produced by Matt Kielty. Sound design & mix by Jeremy Bloom.

Support Radiolab today at Radiolab.org/donate.