India's Constitution, which banned caste discrimination, turned 60 last week. But caste has existed for over 3 millennia, and many people view caste - in addition to curry and the Taj Mahal - as one of India's defining features. We discuss the culture of caste, the reservation system and comparisons to the U.S. Joining Martin Savidge are Vivek Kumar and Corey Washington.

Martin Savidge hosts Barbara Demick of the LA Times and Leon Sigal of the Northeast Asia Cooperative Security Project. They discuss North Korea's recent currency devaluation, how the state is closing underground markets, the grim economic reality for the North Korean people and the prospects of U.S. economic engagement with this rogue and isolated nation.

Christopher Sabatini, the senior director of policy for the Council of the Americas, and Shannon O’Neil, a fellow in Latin American studies at the Council on Foreign Relations, join Martin Savidge to discuss U.S. foreign policy in Latin America. They discuss natural resources, relations with Cuba, Venezuela and the war on drugs.

Our weekly Worldfocus Radio show analyzes three different ongoing conflicts in Yemen: Houthis in the north, al-Qaeda militants and southern separatists. Martin Savidge hosts Christopher Boucek of the Carnegie Endowment and Sudarsan Raghavan of the Washington Post.

The Worldfocus newsroom celebrates the end of the decade with a look at some of the smartest ideas worldwide. We produced an eclectic list of ten innovative solutions to social and political problems. View a slideshow of the winners -- from Bangladesh and Bhutan to Guyana and Rwanda.