23
" That seems reasonable,” I agreed. “My own personal theory is that extraterrestrial life could be here already … and how would we necessarily know? If there is life in the universe, the form of life that will prove to be most successful at propagating itself will be digital life; it will adopt a form that is independent of the local chemistry, and migrate from one place to another as an electromagnetic signal, as long as there’s a digital world—a civilization that has discovered the Universal Turing Machine—for it to colonize when it gets there. And that’s why von Neumann and you other Martians got us to build all these computers, to create a home for this kind of life.” There was a long, drawn-out pause. “Look,” Teller finally said, lowering his voice to a raspy whisper, “may I suggest that instead of explaining this, which would be hard … you write a science-fiction book about it.” “Probably someone has,” I said. “Probably,” answered Teller, “someone has not. "
― George Dyson , Turing's Cathedral: The Origins of the Digital Universe
29
" Complex networks—of molecules, people, or ideas—constitute their own simplest behavioral descriptions. This behavior can be more easily captured by continuous, analog networks than it can be defined by digital, algorithmic codes. These analog networks may be composed of digital processors, but it is in the analog domain that the interesting computation is being performed. “The purely ‘digital’ procedure is probably more circumstantial and clumsy than necessary,” von Neumann warned in 1951. “Better, and better integrated, mixed procedures may exist.”49 Analog is back, and here to stay. "
― George Dyson , Turing's Cathedral: The Origins of the Digital Universe
36
" If life, by some chance, happens to have originated, and survived, elsewhere in the universe, it will have had time to explore an unfathomable diversity of forms. Those best able to survive the passage of time, adapt to changing environments, and migrate across interstellar distances will become the most widespread. A life form that assumes digital representation, for all or part of its life cycle, will be able to travel at the speed of light. "
― George Dyson , Turing's Cathedral: The Origins of the Digital Universe