DryLife is so named because the standard spaceships from normal life; lightweight spaceship, middleweight spaceship, and heavyweight spaceship — also known as "fishes" — do not work, though the glider does. Some other spaceships, such as the weekender and loafer, work in this rule. The copperhead evolves into the closely related c/10 goldenhead, differing from copperhead by two cells in one phase.
A new speed allowed by DryLife is 9c/28 orthogonal. Technology travelling at this speed relies on the R-pentomino. There is a small 9c/28 orthogonal pond puffer, and a 9c/28 spaceship. Guns and breeders have been constructed that fire spaceships and rakes of this speed respectively.
There is a proof sketch of this rule's universality. It is on conwaylife forums, which contains a proof-scheme covering all rules that support glider and their rulestring matches B3*/S23*.
- DryLife at David Eppstein's Glider Database
- Taming B37/S23 (discussion thread) at the ConwayLife.com forums