Hell in a Handbasket notes that Warner Bros. is going to adapt this Robert A. Heinlein SF novel into a movie.
This was one of my favorites as a kid, and I just read it to my kids about a year ago. (In fact, I mentioned it on MO at the time because there was a replacement for the UN in the story, which takes place in the near future.) It’s from Heinlein’s earlier period, and is just plain fun. And amazing, since it was written before man had flown in space.