With Cristina out sick this week, our favourite astronomer Stuart Robbins joins the panel. First Adam looks into aluminum Christmas trees and whether or not \u2018A Charlie Brown Christmas\u2019 is to blame for their demise. Next, Stuart gives us a long promised overview of habitable zones. Lastly, Darren takes a look into a couple of interpretations of the lyrics for \u2018Baby, It\u2019s Cold Outside\u2019.