This acknowledgment is necessary if I am to say thanks to some experts to whom I am indebted. There is Captain Charles Benjamin, who read over the aviation parts of this book with pursed lips and a belligerent attitude toward questionable statements of fact or observation. There is Dr. John Drury Clark, whose authoritative knowledge of rocket fuels was the basis for admitted but not extravagant extrapolation on my part. There is the crew of a four-engined transport ship, who argued over my manuscript and settled the argument by a zestful, full-scale crash-landing drill—repeat, "drill"—expressly to make sure I had described all the procedure just right. There is Willy.
