Brain Twister

"Mark Phillips" was the pseudonym of two well-known science fiction writers: Randall Garrett and Laurence M. Jenifer. Their joint pen-name, derived from their middle names (Philip and Mark), was coined soon after their original meeting, at a science-fiction convention. Both men were drunk at the time, which explains a good deal, and only one ever sobered up. A matter for constant contention between the collaborators was which one. They collaborated for some years, and devised an interesting...