On why 300 years separates the first use of glass lenses in spectacles and their use in a telescope: “In many cases there are times when an invention is technologically possible – and in which it may indeed appear necessary, as the telescope may have – but without a market the idea will not sell, and in the absence of the technical and social infrastructure to support it, the invention will not survive.
James  Burke, Connections
civilization, driving-force, invention, listening, market, science, scientists