A woman looks at the U.S. Capitol on Dec. 31 in Washington. Jacquelyn Martin/AP hide caption

A new study shows that the income gap between young adults who go to college and those who don't only continues to grow. iStockphoto hide caption

The Climate Casino by William Nordhaus looks at the economics and politics of global warming. Courtesy of Yale University Press hide caption

Iranian President Hassan Rouhani delivers a speech during an annual rally commemorating the anniversary of the Islamic Revolution at the Azadi Square in Tehran, on Tuesday. Rouhani called for "respectful, constructive" nuclear talks with world powers — a departure from the hard line of his predecessor, Mahmoud Ahmadinejad. Vahid Salemi/AP hide caption

Alynda Lee Segarra is the lead singer and songwriter of the New Orleans folk ensemble Hurray for the Riff Raff. Debbie Elliott/NPR hide caption

Melissa Conklin, 23, stands in the kitchen of her two-bedroom apartment at Woodmere Trace in Norfolk, Va. She earns about $30,000 a year at a nearby car dealership, and says these apartments are not only convenient, but affordable. She pays about $900 a month here, far less than other apartments in the area. Pam Fessler/NPR hide caption

An evidence locker at the Vermont field office of the Bureau of Alcohol, Tobacco, Firearms and Explosives is filled with confiscated guns. Taylor Dobbs/VPR hide caption

Susan Foster, her 7-year-old daughter Amelia and high school teacher Matthew Caggia attend a rally in Raleigh, N.C., in August against GOP lawmakers' public school policies. Gerry Broome/AP hide caption