After Wednesday's deadly attack on a nuclear scientist in Tehran, Jeffrey Brown discusses the unclear covert sabotage on Iran's nuclear program with Ronen Bergman from the newspaper Yedioth Ahronoth and David Albright of the Institute for Science and International Security.

With nuclear scientist Shahram Amiri back in Iran, Jim Lehrer talks to Greg Miller of the Washington Post and former CIA case officer Arthur Keller for more insight into what this development means for the two countries.

After months saying the United States held him against his will, scientist Shahram Amiri returned home to Iran. Jim Lehrer reports.