content: Airplanes can't be possible, they are heavier than the air!  Perseverance, education, experimentation, intelligence, etc etc. Basically, "where there's a will, there's a way" has a real meaning. And what the Japs are doing, a huge project, has real meaning. Even if they fail, the next effort will be better. And the next one. And so on. Until they build something amazing.