There’s a new building block in the nanoscience tool box. Scientists at Berkeley Lab’s Molecular Foundry used a recently discovered, donut-shaped protein to build customizable nanotubes that can be lengthened, shortened, or sealed at both ends to form capsules. Although still in the early investigational stage, these tailorable nanotubes could someday be used in a number of applications in which the ability to manipulate a nanotube’s length and chemical properties is critical. credit: Lawrence Berkeley Nat'l Lab - Roy Kaltschmidt, photographer