More on the previous topic. Kevin D. Keck writes "LBNL Material Sciences researchers today announced 'the achievement of controllable, reversible atomic scale mass transport along carbon nanotubes' in the April 29 issue of Nature [HTML] [PDF] and in a press release. 'Weíre not transporting atoms one at a time anymore ó itís more like a hose,' says Chris Regan (coauthor). 'In order to build a structure we have to be able transport material to the construction site, and weíre developing a better way to do that. Our nanoscale mass delivery system is simple and reversible. It requires only a nanotube, a voltage source, and something to transport."