Bruce Hollebone writes "Last week, chemists at the University of Rochester reported they had figured out how to get optical plastics to self-assemble (Abstract from Science ,requires login. non-technical summary from ABC News). This material could be an important step towards better photonics, including an optical computer. This is real nano-tech, with precise molecular control. The molecular structure of the plastic was engineered to be a precise shape from the human scale right down to the atomic level. The point here is that this was done with boring old chemicals in test tubes rather than the exotic "nano-machines", proposed by the Drexlerites, shrouded in their mists of vapour. "