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What is a low technology you really love ?
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On this same note, insulation in general. We can only make something so strong, conductive, heat-resistant, light or hard, so we've internalised the expectation that there's always practical limits. But insulative? There just isn't one. That means that with an arbitrarily small source of energy - body heat is not only possible but typical - you can overcome unlimited external coldness. We've being doing this since before we were human, by many definitions.