That'll be harder, won't it? It's not a real concept entering science fiction and being widely used, so there'll be less information around to find.
I'd say Smith was using the known stable heavy metals, and then implying there are heavier ones with even more unusual properties, and that what little of those there is on Earth will be most likely found mixed with the things chemically like it.
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timeasmymeasure
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Date: 2007-11-27 05:45 am (UTC)I'd say Smith was using the known stable heavy metals, and then implying there are heavier ones with even more unusual properties, and that what little of those there is on Earth will be most likely found mixed with the things chemically like it.