Either flying cars or nuclear fusion power. Though, IIRC, that was rather more prominent in Popular Science-style predictions rather than fiction as such, whereas the flying cars were a thing in both.
That, and cheap space travel. It sort of blends into the background for some reason, but that was everywhere in early sci-fi.
I suppose it depends on what you mean by "iconic". I think that an implausibly powerful laser gun is more ubiquitous in science fiction, but not having a flying car is what constantly reminds me that we have yet to be living in the future.
Yes, exactly: for me a flying car is not iconic of science fiction but of the ways in which science fiction is not predictive. Which is not the same thing.
I still think (and we actually were discussing it today) that Star Trek and their whole transporter technology has lead to many a comment of "where is my g*d-damn transporter device anyways!".
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That, and cheap space travel. It sort of blends into the background for some reason, but that was everywhere in early sci-fi.
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