Wallace also has some nice quotes, among them are: "I don't know how to refute an incredulous stare". (David Lewis)& Paul Davies: "So the parallel universes ar

Wallace also has some nice quotes, among them are: "I don't know how to refute an incredulous stare". (David Lewis)& Paul Davies: "So the parallel universes are cheap on assumptions but expensive on universes". David Deutsch: "Exactly right. In physics we always try to make things cheap on assumptions."