Scientists at DOE's Brookhaven National Laboratory and the University of Bielefeld, Germany, have discovered a new type of hollow spherical vesicles formed by large-scale, wheel-shaped inorganic molecules. These vesicles, described in the November 6, 2003, issue of Nature, represent a new kind of self-assembly in nature with implications for the emerging field of nanoscience as well the solution behavior of other types of particles or systems previously thought to be unrelated.