Stuart Halloway, author of "Programming Clojure", tells Susannah Pfalzer all about this new and cool programming language. Stuart explains how Clojure helps you move beyond noun-based programming toward verb-based programming, and why pure functions are important for concurrency. It's a lot of Lisp, but with Less parentheses--even fewer than Java itself. See how to be more expressive on the Java VM, and how Clojure is different from Scala and Groovy.