"One of the stories I love is how Gutenberg’s printing press set off this interesting chain reaction, where all of a sudden people across Europe noticed for the first time that they were farsighted, and needed spectacles to read books (which they hadn’t really noticed before books became part of everyday life); which THEN created a market for lens makers, which then created pools of expertise in crafting lenses, which then led people to tinker with those lenses and invent the telescope and microscope, which then revolutionized science in countless ways."