Recently finished: Cities In Flight by James Blish.
Blish is an old school sf writer, active from the late '40s through his (early) death in 1975. He wrote one of my favorite sf books, Startide Rising [edit: no, no he didn't, you idiot], so I have read some of his other stuff. Most of it hasn't impressed me much, but I keep hoping.
Cities In Flight is actually a compilation of 4 related novellas (most are 120-150 pages; the longest over 200) that deal with man's history between about 2000 CE - 4000 CE. They were written between about 1955 and the late '60s. The science is almost entirely handwaving, but that doesn't usually bother me - tell me something works and I'll buy it, as long as it's consistent and in support of a good story. In this case, there are 2 items: anti-aging drugs that make humans effectively immune to natural aging and death, and "spindizzies" which are gravitational field generators that make it possible to take, say, New York or Scranton, and fly it like a spaceship at far past the speed of light. Those concepts are not the real problem.
The problem is the format. The overall story is thousands of years long and galactic (or larger) in scope. Since these were novellas, that means they are compressed almost to the point of incomprehensibility and there are a number of either deus ex machina resolutions or simple anticlimaxes. For instance, literally between one paragraph and the next, the entire galactic economy crashes with zero foreshadowing. A religious tyranny that is conquering parts of the galaxy by force leaves a particular planet alone more or less because the main character tells it to, and is almost never heard of again. Scientists on a remote planet just happen to have a secret electronic computer-virus-analog weapon that they use to destroy invincible alien attackers that we hear of but never actually learn anything about. They are simply put out of the picture at a convenient time.
Also, I am neither a scientist, a mathematician, nor a historical philosopher. There is a ton of obscure concept- and name-dropping in all those subjects that is supposed to add weight to the concepts. My problem is I don't recognize any of it so I can't even tell which are real and which are "future history", let alone how they are supposed to inform the story.
So, overall, it was a bit of a frustrating slog that was ultimately unfulfilling. At this point, I'm starting to thing Startide Rising was a fluke [edit: there's a reason for that].
Oh, and, the cover design of this edition was not only terrible graphically, the image was horribly ugly and completely irrelevant to the story.
