The United States of America, home to 323 million people, and 300 million guns.  To put that another way, with less than 5% of the world’s population, the United States is home to roughly 50% of the entire world’s civilian-owned guns. Nicholas Kristof is a Pulitzer Prize winning New York Times journalist who has covered US gun violence extensively; and I caught up with him to learn more about the relationship between the United States, and its guns.