All Things Considered

Certain truths about life in a neighborhood are readily apparent to people who live there, but less obvious to city and state officials. The Justice Mapping Center uses data to help bridge that gap with information about the prison system. By mapping the residential addresses of every inmate in various prison systems, Eric Cadora and his colleagues have made vividly clear a concept they call "Million-Dollar Blocks." In some places more than a million dollars are being spent every year to incarcerate the residents of a single Census block. Audie Cornish talks with Eric Cadora.

Large crowds of anxious Iranians gathered in Tehran on Sunday and Monday at foreign exchange offices — some of which had shuttered their doors — as Iran's currency continues its free fall.

From Sunday to Monday, the rial lost nearly one-third of its value against the dollar — and the decline appears to have continued Tuesday.

Melissa Block profiles several of the newly announced 2012 MacArthur Fellows. In this segment she speaks with Laura Poitras, a documentarian who is making a trilogy of films about the post-Sept. 11 world.