Forget those fears of nanoscale, self-replicating robots reducing the world to grey goo and wiping out civilization. Eric Drexler, who first warned us the world would be consumed by nanobots now thinks maybe it won't happen. His solution? Instead of building intelligent, self-replicating nanotechnology, we should build limited, dumb nanobots that would be permanently mounted in a sort of 3D printer arrangement. Drexler says "a machine like a desktop printer is, to say the least, unlikely to go wild, replicate, self-organise into intelligent systems, and eat people". Read the Guardian article for the overview or visit e-drexler.com to find out all the details.