Wafting a load of rhubarb farts into our final episode of the series is Rob Scargill, Interpretation Developer at the National Railway Museum. We've done trains before, sure, but we haven't done interpretation now have we guys. Rob explains how everything (literally, everything) you experience in a museum is thought out - from the stories you tell about an object to the colour light you shine on it. This episode also features a live moderate disaster, when we accidentally melted Sara's head...