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    <title>Jack Challis — Essays</title>
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    <description>Notes on optimization, AI-assisted building, and the machinery underneath both — written by a physicist who ships production systems for a living.</description>
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      <title>Through the Looking Glass</title>
      <link>https://dodecaplex.co/writing/through-the-looking-glass/</link>
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      <pubDate>Mon, 28 Sep 2026 12:00:00 +0000</pubDate>
      <description>Career advice usually arrives as a smoothed biography. Step through the mirror instead, look hard at three terrible ideas, and see what they reflect back.</description>
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      <title>More or Less</title>
      <link>https://dodecaplex.co/writing/more-or-less/</link>
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      <pubDate>Wed, 01 Jul 2026 12:00:00 +0000</pubDate>
      <description>A physicist's framework for changing your life — feel the local slope, take one small step downhill, and repeat.</description>
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      <title>Vibe DevOps: the boring parts that make it work</title>
      <link>https://dodecaplex.co/writing/vibe-devops/</link>
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      <pubDate>Wed, 01 Apr 2026 12:00:00 +0000</pubDate>
      <description>Invest your discipline at the boundaries — inputs, outputs, contracts, guardrails — and let the model be loose and creative inside them.</description>
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      <title>Cheap or expensive is the wrong question</title>
      <link>https://dodecaplex.co/writing/cheap-or-expensive/</link>
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      <pubDate>Sun, 01 Feb 2026 12:00:00 +0000</pubDate>
      <description>$0.14 a million tokens and $160 for an hour of a frontier model are two points on the same curve — not an argument about whether AI is cheap.</description>
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      <title>The one AI metric that matters: H₅₀</title>
      <link>https://dodecaplex.co/writing/h50/</link>
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      <pubDate>Fri, 01 Aug 2025 12:00:00 +0000</pubDate>
      <description>Most people track AI benchmarks that don't matter for real work. Here's the one that does: the longest task an agent completes with 50% reliability.</description>
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      <title>What I wish I knew before a Physics PhD</title>
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      <pubDate>Wed, 01 Jan 2025 12:00:00 +0000</pubDate>
      <description>The economics, the opportunity cost, and the unstructured time that paid off more than the degree itself.</description>
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