Number 47 (Story #2), September 13, 1991 by Phillip F. Schewe and Ben Stein QUASICRYSTAL SEMICONDUCTORS are being sought by scientists in Grenoble, France (T. Klein et al., Phys. Rev. Lett, 3 June 1991). They found that at a temperature of 1 K the electrical conductivity of a high-quality AlCuFe quasicrystal was much lower then for typical metals. Furthermore, the conductivity was found to be sensitive to small changes in the composition, a property characteristic of doped semiconductors. Lowering the temperature or increasing the quality of the sample further reduced (rather than enhanced as with metals) the conductivity. (Nature, 5 Sept. 1991.)