Nanotechnology: Drexler and Smalley make the case for and against molecular assemblers (Richard Smalley argues that laws of chemistry imply it will be impossible to ever create self-replicating nanobots whose abilities to assemble molecules are significantly different than those of biological self-replicators. Some pro-nanobot responses to Smalleys argument can be found at Debate About Assemblers — Smalley Rebuttal, The Drexler-Smalley debate on molecular assembly, Of Chemistry, Nanobots, and Policy, and Is the Revolution Real?)