1. S. Rasmussen is at Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
2. L. Chen is at Argonne National Laboratory, Argonne, IL 60439, USA.
3. D. Deamer is at the University of California at Santa Cruz, Santa Cruz, CA 95064, USA.
4. D. C. Krakauer is at the Santa Fe Institute, Santa Fe, NM 87506, USA.
5. N. H. Packard is with ProtoLife Srl, Venice, Italy.
6. P. F. Stadler is at the University of Leipzig, Leipzig, Germany.
7. M. A. Bedau is at Reed College, Portland, OR 97202, USA.(S.R.)