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Think the decision to smoke or quit is solely a personal matter? Think again. Researchers have found that relationships, even many degrees removed, can have a big influence on behavior.

The war in Iran has already cost the U.S. billions of dollars. Here's the impact by the numbers.

There are many ways to look at civil war: ethnic factions, economic divides and religions differences. But increasingly, some say we should also look at climate change as a factor as well, as it is often what forces internal migrations in nations already simmering with ethnic and sectarian tensions.

According to a report released by the Department of Health and Human Services, "premiums nationwide will ... be around 16 percent lower than originally expected," and 95 percent of uninsured people live in a state with average premiums that are lower than expected.

NPR, the Robert Wood Johnson Foundation and the Harvard School of Public Health conducted a nationwide poll about the stress felt by Americans, where it comes from and what they do about it. Reporter Richard Knox cherry-picks some of the more interesting results for Robert Siegel.

The new law specifically protects religious opposition to same-sex marriage, extramarital sex and transgender people. Gov. Phil Bryant said it "merely reinforces" existing religious freedoms.

Boycotts of North Carolina are expanding in protest of the law as a violation of the rights of transgender people. Renee Montagne talks to Democratic State Representative Ken Goodman.

Social science research examines how the mood of gamblers can change the way they think about risk. New Yorkers buy more lottery tickets when the weather is good and when their sports teams win games.

President Obama once said he would go to Cuba only if the human rights situation on the island improved. Critics say he's crossed his own red line by going now when political arrests are up.

Rising prices, shortages of basics and growing frustration with Sudan's long-serving president have fueled a week of anti-government protests that are spreading across the country.