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2/ Apocalyptic fiction loves the theme of some mysterious X that destroys digital tech and bumps us back to bows and arrows
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5/ So taking "digital" broadly, you can imagine it in embodied in ever medium from abacus to paper to semaphore to telegraph to silicon
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6/ Let's define "post-apocalyptic" as a) loss of deep industrial stack tech (no VHDL, fabs, b) loss of broad global social connectivity
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9/ Opportunity #2: Build a mechanical semaphore network, visible to all, that uses packet routing (old semaphores were circuit-switched)
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10/ Opportunity #3: Clock signals are central to digital technology. Develop square wave generators using mechanical, hydraulic, pneumatics
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