In a development that brings the promise of mass production to nanoscale devices, Berkeley Lab scientists have transformed carbon nanotubes into conveyor belts capable of ferrying atom-sized particles to microscopic worksites. Someday, nanoscale conveyor belts could expedite the atom-by-atom construction of the world's smallest devices. Nanotechnology (nanotech) is the manipulation of matter on an atomic, molecular, and supramolecular scale.