Terry Gross

A jazz pianist and bandleader, Iyer is one of the most critically acclaimed musicians of the past decade. He also has a masters in physics. Here, he explains why he decided to switch to a full-time career as a jazz musician, and describes what influenced his latest album, Solo.

In the Oct. 18 issue of The New Yorker, historian Sean Wilentz argues that the rhetoric expressed by both Glenn Beck and the Tea Party is nothing new -- and is rooted in an extremist ideology that has been around since the Cold War.

The AK-47 was created by the Soviets after World War II and changed the way war is fought. Pulitzer Prize-winning war correspondent C.J. Chivers explains how the gun became the weapon of choice for insurgents, terrorists and child soldiers.