Dan and Greg bring Janet the Librarian on to discuss The greatest show on earth, They natter about right handed cavemen and they resolve the National Anthem competition.

Interview: Matt Thompson. Segments: Stephen Hawking, The Moon, Leap Seconds. Sketch: Officer Robot.

Brain Dunning discusses zombie powder, ring worlds, testing psychics and bringing back the mammoths.

Interview: Brian Dunning. Segments: Flying Reindeer, Naming Elements. Sketches: Super Villains, Be Bad

Interview: Steve Nerlich. Segments: Extinction, Pink is not Magenta

Interview: Steve Nerlich. Segments: Anthem, Tithing. Sketches: Bucks night, Interesting game, Meteorologist.