| http://www.w3.org/ns/prov#value | - To Smith, and to other writers at the time, particularly Heinlein and Asimov, the future looked like it was all based on increasingly sophisticated vacuum tubes. (Tube-based learning systems show up in Heinlein's The Door Into Summer, as I recall.)Actually, while I am on about it: Asimov cheated, as regards hard science, by waving his hands and making up 'positronics' that drove his robots' brain
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