Erratum.
In Arthur L. Robinson's Research News article "Electron microscope inventors share Nobel physics prize" (14 Nov., p. 821), the quantum mechanical wavelength of an electron with an energy of 100 kiloelectron volts is incorrectly stated to be about 0.1 angstrom (p. 821, column 2). The correct value is 0.037 angstrom. Also, the electron column of the first electron microscope was vertical, not horizontal.