Number 7 (Story #3), November 1, 1990 by Phillip F. Schewe and Ben Stein A SCANNING TUNNELING MICROSCOPE WITH A GOLD TIP can deposit small hills of gold atoms only 10 nm wide by 2 nm high. In an STM setup at IBM, scientists evaporate atoms from a gold microscope tip onto a gold substrate only nanometers below. Although the "structures" (the small hills, consisting of perhaps thousands of atoms) created are not as small as those achieved by a different IBM group (which manipulated individual atoms) earlier in the year, the conditions in this case are much more favorable: the gold STM operated in air rather than at low temperatures or in high vacuum. Furthermore, the gold tip did not wear out as is the case in many other STM applications. (Physical Review Letters, Nov 5. Contact: H. John Mamin, IBM Almaden Research Center, 408-927-2027.)