| http://www.w3.org/ns/prov#value | - We know how to build avionics and other electronic systems that work over long periods of time (geo synch satellites are an example as is most of the stuff on the space station), we dont seem to know how to build a ???reusable??? rocket engine???but on the other hand SpaceX seems to be coming close to at least one that seems to have many ???full burn??? cycles on it??????the materials that make th
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