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Oct 6, 2014 at 22:10 comment added Colin Pickard +1 The Uros people have been around since before the Incas and their floating islands would rot and sink within weeks without constant renewal. Also the question asks about preserving technology. Historically, technology often requires constant maintenance and improvement to remain viable.
Oct 6, 2014 at 18:16 history answered Loren Pechtel CC BY-SA 3.0