 This clearly can be avoided, Taylor suggests, if nuclear reactors are protected and all sources of nuclear fuel elements are heavily guarded.Ultimately, it is evident that most of Taylor's writing—along with McPhee's narration of Taylor's viewpoints and suggestions—is ahead of its time and still applicable today.According to Freitas and Merkle, the only known extant source on Taylor's concept of the "Santa Claus machine" is found in Nigel Calder's "Spaceships of the Mind".