Years of work by journalist Jamie Kalven resulted in a sweeping report on corruption in the Chicago Police Department. Scott Olson/Getty Images hide caption

Lead pipes like this one still bring water into many U.S. homes. Seth Perlman/AP hide caption

Police in riot gear stand around an armored vehicle as smoke fills the streets of Ferguson, Mo., in November 2014. Charlie Riedel/AP hide caption

The Book Concierge: Find your next read with NPR's 2014 book guide >> NPR hide caption