Terry Gross

Veteran peace negotiator Padraig O'Malley worked on the conflicts in Northern Ireland and South Africa. Mac Maharaj played a role in the latter nation's anti-apartheid movement. Both took part in recent closed-door negotiations in Finland, aimed at bringing reconciliation among rival factions in Iraq.

The United States is home to less than five percent of the world's population — and almost a quarter of the world's prisoners. Adam Liptak, national legal correspondent for The New York Times , says that's one of the ways America's legal system differs from those of other countries.

Retired U.S. Army Lt. Gen. Ricardo Sanchez commanded ground troops in Iraq from 2003 to 2004; it was on his watch that the Abu Ghraib prison scandal took place. Subsequently, Sanchez has vocally criticized the conduct of the Iraq war — especially the Bush administration's "catastrophically flawed, unrealistically optimistic war plan." His new book is Wiser in Battle: A Soldier's Story.