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Coverage of President Obama's speech about proposed changes for the National Security Agency continues with more of his comments, plus analysis.

Venezuela is running out of newsprint and newspapers are shutting down. Media outlets say that it's another form of harassment by a government that often doesn't like what independent media reports.

The U.S. has been stepping up efforts to encourage international tourism, which represents about 3 percent of the country's gross domestic product. The country's reputation abroad has suffered due to revelations about spying by the National Security Agency. But Brand USA, which is running a new ad campaign, hopes to encourage international tourists to visit the U.S. Host Arun Rath speaks with Michael Scaturro, who wrote about the new campaign for The Atlantic.

On Monday, the nuclear deal between six world powers and Iran officially kicks in. But this agreement is just a first step in a long negotiation process. NPR's Arun Rath talks to Karim Sadjadpour, senior associate at the Carnegie Endowment for International Peace, about what to expect from additional disarmament talks.

Some of the earliest science fiction imagined voyages to Mars. We now have the space-faring technology to make reaching the Red Planet possible. It would involve massive resources and many potential dangers, but some believe the rewards would be massive.

As many as 15 percent of babies have colic, which can cause bouts of inconsolable crying. Researchers are testing probiotics to see if these good bacteria can help. But they don't know how the supplements work, or how they may affect children's health long term.

Melissa Block talks with Nicholas Griffin about his book, Ping-Pong Diplomacy, which explores the importance of the tabletop game in Chinese political history and foreign policy.

An Illinois case examines whether states may recognize a union for workers who care for disabled adults in their homes instead of state institutions, and whether non-union members must pay for a contract they benefit from.