Nadolig Llawen to all our Listeners We hope Sion Corn has visited you on this fine festive day. For indeed we are BACK! And this episode went a bit Welsh! Much to Ben's chagrin. In this episode we find out: the female version of phallic; what eggnog actually is; how NORAD tracks santa; and how following stars probably won't lead you to the next messiah. To ensure at least some expertise on the panel we are joined by the wonderful physicist, astronmer and raconteur: Dr William Taylor   Further reading links: download the free software Stellarium to track the stars positions throughout time and space; track Santa using NORAD; have a look at Quartz modelling of the Christmas lights turn on time, which produces the below graph that we talk about. Subscribe via iTunes. Follow us on twitter @PodcastMathsAt, as well as @ThomasEWoolley and @benmparker.