Nuclear Stalemate: "Blowups Happen" by Robert A. Heinlein
(Original Review, 1980-07-26)
Although Clarke was far ahead of his time in regard to synchronous communications satellites, even here he missed a few beats. Although I have not read his science article detailing the suggestion, his early fiction always had the satellites MANNED. He did not foresee the fantastic reductions in size of electronics (semi-conductors were yet to be invented) or their corresponding increase in reliability.
If you're into stuff like this, you can read the full review.