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Sunday's Democratic debate was the last one before the Iowa caucuses. David Greene talks to Cokie Roberts and Margie Omero, a Democratic pollster from the firm Purple Strategies.

The inconsistencies of U.S. immigration policy is in focus in El Salvador. Two groups of migrants — Cubans and El Salvadorans — receive very different receptions at the U.S. border.

A non-profit organization in Berlin has invented a small portable transmitter that can download satellite signals and rebroadcast them on FM for Syrians to listen to on their car or household radios.

Kevin Bales' book, Blood and Earth, explains why slavery in the world's lawless zones is essential to operate mines that pose a grave threat to the environment.

With many sanctions against Iran lifted, businesses in the U.S. and Iran are gearing up to cash in. U.S. and Iranian business people gauge where they see things going.

An investigation into the killing in Britain of Alexander Litvinenko puts the blame on the Russian government. The British report says President Vladimir Putin likely approved the assassination.

Maurice White, the founder of Earth, Wind & Fire, has died at age 74. The horn-driven band was known for 1970s hits such as "Shining Star" and "September."

It's been three years since WikiLeaks founder Julian Assange took refuge in Ecuador's embassy in London. He was avoiding arrest and extradition to Sweden to face allegations of sexual assault.

For more than a year, a family in Britain had been searching for their kitten. Clive recently was found inside a pet food warehouse. When he was finally discovered, Clive was quite the fat cat.

Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, talks with Mary Louise Kelly about how the Zika virus may spread.