Dave Davies

In 2003, a hospital nurse named Charlie Cullen was arrested under suspicion of injecting patients with lethal doses of a variety of medications. He is now considered one of the nation's most prolific serial killers. Journalist Charles Graeber explains how the hospital system failed to stop Cullen.

In a new book, Washington Post economics writer Neil Irwin looks at an elite group of policymakers from around the word who manage the money supply, and explains how money can come from -- and disappear into -- thin air based on the decisions of these influential men and women.

In a series for The New York Times, environmental reporter Justin Gillis has been exploring whether harsh weather events are connected to global warming or if they are simply the random violence nature visits upon us.