The Hopkins manuscript by RC Sheriff is more of that kind of science fiction story. It was published in the 1930s, probably written after World War One,. But before World War Two in that strange period. What's it about? I mean, obviously it's a lot of it takes a lot of fictional liberties with it. And here's how we use engineering or physics or botany to solve that problem. Right. So there's the hard science on the one end of the spectrum and then using that to tell a human story.