This week, The Naked Scientists are spreading festive cheer as they get ready for Christmas, all in one hour! Joined by psychologist Philipe Bujold, tech expert Alex Farell, vibrations engineer Hugh Hunt and Plant development researcher David Hanke, Chris Smith and Georgia Mills tackle the physics of carol singing, firing up the christmas snacks - literally - and, whether you like them or loathe them, the biology of brussel sprouts.