A logarithmic spiral with a diameter of 500 μm, approximately half the diameter of a sewing needle. Curiosity about a mistake that left tiny dots on a germanium wafer with evaporated metal films led ...

Proceedings of the National Academy of Sciences of the United States of America, Vol. 90, No. 6 (Mar. 15, 1993), pp. 2509-2511 (3 pages) Scanning force microscopy was used to analyze banded human ...