Was reminded of that too (currently re-reading another classic Heinlein) but if they were going for that, you'd think they would have stuck with "of" rather tha

Was reminded of that too (currently re-reading another classic Heinlein) but if they were going for that, you'd think they would have stuck with "of" rather than "on" Podkayne of Mars is often taken to be one of Heinlein's juvenile novels (based on the story) but that was not his intent, and he said the "moral" was aimed at adults.