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An episode of This Week in Startups in which Jason Calacanis interviews Ruby on Rails creator David Heinemeier Hansson. They discuss startups, bootstrapping and 37signals' approach to business.

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.

Conan O'Brien interviews Jack White in a Serious Jibber-Jabber episode shot on 35mm film. They discuss White's creative process, his use of constraints and his approach to music and art.

A short clip of Stephen Fry explaining the differences between American and British comedy. He attributes them to cultural attitudes such as optimism versus pessimism.

Freeman Dyson recounts how Enrico Fermi rejected his team's meson scattering model, noting that it had too many free parameters. It is the source of the quote about fitting an elephant.

In a New York Times interview, Jerry Seinfeld describes the anatomy of his Pop-Tart joke, still a work in progress, and shows his longhand writing process.