An assassination in Tehran has raised questions about who was responsible. The victim was nuclear physics professor Masoud Ali Mohammadi. An Iranian prosecutor claimed the C.I.A. and Mossad probably had a hand in the killing. For more about covert efforts to undermine Iran's nuclear program, Daljit Dhaliwal speaks to Flynt Leverett.

Part 3 of 6 in our series on the people and culture of North Korea. Worldfocus multimedia producer Ben Piven writes about his encounter with North Korean Major Im Dong-chul while on the northern side of the Demilitarized Zone that separates the two Koreas.

Gideon Rose of Foreign Affairs Magazine and Carol Giacomo of The New York Times editorial board join Daljit Dhaliwal to discuss whether Iran appears to be pulling back from a deal to ship enriched uranium overseas. They also discuss fair elections in Afghanistan and NATO's decision to support a wider war counter-strategy.

An Iranian scientist remains missing after a pilgrimage to Saudi Arabia in June. Many in Iran assume that Amiri defected, but the U.S. denies any involvement. Nazanine Moshiri of Al Jazeera English reports from Tehran.

In addition to holding the Iranian government accountable for its nuclear ambitions, writes Worldfocus contributor Dwight Bashir, the P5+1 should use its new platform to raise substantive human rights issues -- and not just behind closed doors.