Gerard Barron whips out what looks, at least to me, like a fossilised dog turd from his jacket pocket. It's his prop. His killer sales moment. You know he's done this a thousand times before — to would-be investors, journalists, politicians, and airport staff wanting to know what that lumpy thing he's trying to get through security screening is. Because everywhere he goes, Gerard Barron carries this rock. This coal-coloured nugget could help him become one of the richest men on the planet.