- von Neumann probes, Dyson spheres, exploratory engineering and the Fermi paradox - YouTube http://www.youtube.com/watch?v=zQTfuI-9jIo 3 comments space
- von Neumann probes, Dyson spheres, exploratory engineering and the Fermi paradox - YouTube http://www.youtube.com/watch?v=zQTfuI-9jIo 5 comments science