For
Susan Casper,
who
taught me the
value
of π
The editor would like to thank the following people for their help and support: Virginia Kidd, Robert Silverberg, David G. Hartwell, Susan Casper, Kirby McCauley, Fred Fisher of the Hourglass SF bookstore in Philadelphia, and Tom Whitehead and his staff from the Special Collections Department of the Paley Library at Temple University.