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A This Week in Startups episode in which Jason Calacanis interviews David Heinemeier Hansson of 37signals. They discuss bootstrapping, company philosophy and views on the tech industry.

A standing whiteboard conversation at Lang.NEXT 2012 among Carl Hewitt, Erik Meijer and Clemens Szyperski about the actor model. Hewitt, who originated the model, explains its foundations.

A Channel 9 Going Deep interview in which Brian Beckman talks with Rich Hickey, creator of Clojure, about the language's design. It covers Clojure's persistent data structures, reference types and its approach to concurrency on the JVM.

Jonathan Schiefer interviews Larry Wall, creator of Perl, in a 33-minute conversation. Wall discusses his self-designed linguistics degree and how language and programming overlap.