About now, they escaped the closeness of the Fun Fair and stopped in an open square near a church. 'Nicolaikirche – I was baptized there,' the Doctor said. ' Kuxen! A topic strangely related to dyadic numbers in that the number of Kuxen in a particular mine is always a power of two, videlicet: one, two, four, eight, sixteen . . . But that is a mathematical curiosity in which you'll have little interest. I am selling them. Should you buy them? Formerly a prosperous industry, upon which the fortunes of great families such as the Fuggers and Hacklhebers were founded, silver mining was laid low by the Thirty Years' War and the discovery, by the Spaniards, of very rich deposits at Potosí in Peru and Guanajuato in Mexico. Buying Kuxen in a European mine that is run along traditional lines, as is done in the Ore Range, would be a waste of the lady's money. But my mines or I should say the mines of the House of Brunswick-Lüneburg, which I have been given the responsibility to manage, will be, I think, a better investment.'