Happy pi day everyone.  We figure that pi day is the like Hallowe'en for mathematicians. It's a day they get to cut loose and throw away their inhibitions. As such Lorraine's intro pertaining to strong language is particularly pertinent for today's podcast. It starts out quite coarse. So sit back, grab a slice of your favourite pie and enjoy as Ben sings you the song of his people. Further reading links: Why not listen to our review of the film pi; The best web address known to man; The song from pi's digits; Search pi for meaningful numbers; Weird ways of calculating pi; Known digits of pi over time. Subscribe via iTunes. Follow us on twitter @PodcastMathsAt, as well as @ThomasEWoolley and @benmparker.