My neighbour is a Professor of Astro Physics who has been involved in the planning and programming of the James Webb Telescope which has unfolded itself in space, and in time, will send us back Infra Red images from the distant universe. Collecting banknotes may seem a long way from the wonders of the universe and Dark Matter. However, the collector is always looking for something a bit special to add to the collection  as well as filling in the gaps. The focussed, gimlet eyes of the banknote collector might not see into the distant realms of the universe but certainly search for something new to discover and to add to the collection.