The Evolution of Science Fiction discussion

Which predictions about the future found in early sci fi do you think have been fairly accurate (technological advances, communications abilities, space travel, etc)?

Firstly, I have to note that IMHO SF isn't futurology and it is much more about what if than gadgets and the like. So, say the equivalent of mobile phones is in a lot of old SF, but I cannot recall any with a smartphone equivalent.

Oleksandr, you are absolutely right that no one got the quick miniaturization of electronics. However, I just read a 1954 story by Brian W. Aldiss, "Criminal Record," which has the first reference I have ever seen to a videodisc.

I think space travel has been a part of sci fi from the early 1920-40s. I think authors underestimated the challenges space presents but it's been interesting to dream of going to different planets.

Natalie wrote: "I think space travel has been a part of sci fi from the early 1920-40s. I think authors underestimated the challenges space presents but it's been interesting to dream of going to different planets."

I'd say they were more interested in planets as a setting; therefore, even some fantasy ways of transportation are used like in A Princess of Mars. Even if they were interested in space flight, often they simplify as in The Moon-Voyage

Thomas wrote: "Oleksandr, you are absolutely right that no one got the quick miniaturization of electronics. .."

Yes, no direct mention of the miniaturization. At the same time, indirectly, say Asimov's robots have to use much more 'dense' electronics to 'think' than we have now.

I was thinking about possible medical advances that may have been mentioned, beyond cryogenics and such but cannot at the moment think of anything off the top of my head.
Does anyone have any mentions?

Well, going back a ways, there's Frankenstein, with the idea that a person can be made by just sewing together pieces.
In Herland and I believe one of HG Wells books, disease has been completely eradicated.

There are longevity drugs in Kim Stanley Robinson and in James Blish (if memory serves.)