Timothy Lanzone on the set

*Travelling Salesman* is an unusual movie: despite almost every character being a mathematician there's not a mad person in sight. Moreover, the plot centres on one of the greatest unsolved problems in mathematics, does P = NP? We were lucky enough to host the UK premiere of this movie last month, here at the Centre for Mathematical Sciences , the home of *Plus*. We spoke to Jonathan Oppenheim from University College London about the maths behind the movie and to the film's writer and director, Timothy Lanzone about creating drama from mathematics.

*(The sound effects used in this podcast are by jlozano and nemoDaedalus.)*

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