Yes. When Heinlein was writing it, he made one of his annual calls soliciting blood donations at the WorldCon. I wasn't at home to take the call, so he chatted for a while with my younger son, then in high school. He mentioned some things about "a forthcoming story," which I recognized when I read it. I thought it was very gentelemanly of Heinlein to take the time to chat with a high school student, even though he had a lot of calls to make.