1. J. Bland-Hawthorn is at the Anglo-Australian Observatory, Epping, NSW, 2121 Australia.
2. A. Harwit is at Transparent Networks, Milpitas, CA 95035, USA. M. Harwit is at 511 H Street, SW, Washington, DC 20024, USA, and is Professor Emeritus, Cornell University, Ithaca, NY, USA.