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@gbj_tester
James Burke hypothesises that in 40 years (about the same time scale as fusion plants replacing thermal and nuclear fission electricity generation, if we're lucky) we will all have nano-bot factories in our homes to manufacture whatever we need from a feedstock of dirt and energy. As such, we won't need bicycle mechanics, we will just point the nano-bots at the BB and tell them to manufacture new bearings in situ