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    "story_id": "mp-2026-09-11-026",
    "source_story_id": "tmp-story-in-hand-robot-pen-writing",
    "edition_id": "mp-2026-09-11-morning-0064",
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    "position": 15,
    "story_type": "dispatch",
    "section": "robotics",
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    "headline": "A Robot Hand Began Writing After Eighteen Seconds",
    "slug": "a-robot-hand-began-writing-after-eighteen-seconds",
    "dek": "Real-time Jacobian estimation produced 0.6-millimeter mean in-plane precision without demonstrations, simulation training or an analytic contact model.",
    "summary": "Real-time Jacobian estimation produced 0.6-millimeter mean in-plane precision without demonstrations, simulation training or an analytic contact model.",
    "body_text": "The controller estimates the combined hand-and-object task Jacobian online, avoiding a prebuilt kinematic and contact model for a grasped pen. On a physical anthropomorphic hand it began writing after about 18 seconds of initialization using only a laptop CPU, then continued adapting as it traced letters and shapes in air and on paper. Mean in-plane error was 0.6 millimeters across runs. The same formulation was also exercised on two simulated hands. This is a narrow single-stroke dexterity result, but it offers a data-light alternative to reinforcement and imitation learning for contact-rich manipulation.",
    "why_it_matters": "Real-time Jacobian estimation produced 0.6-millimeter mean in-plane precision without demonstrations, simulation training or an analytic contact model.",
    "limitations": [
      "On a physical anthropomorphic hand it began writing after about 18 seconds of initialization using only a laptop CPU, then continued adapting as it traced letters and shapes in air and on paper."
    ],
    "importance": 8,
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    "first_published_at": "2026-09-11T09:00:00.000-04:00",
    "modified_at": "2026-09-11T09:00:00.000-04:00",
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        "text": "Real-time Jacobian estimation produced 0.6-millimeter mean in-plane precision without demonstrations, simulation training or an analytic contact model.",
        "source_ids": [
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        "qualification": "On a physical anthropomorphic hand it began writing after about 18 seconds of initialization using only a laptop CPU, then continued adapting as it traced letters and shapes in air and on paper."
      }
    ],
    "source_ids": [
      "source-2026-09-11-015"
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    "tags": [
      "robot dexterity",
      "in-hand manipulation",
      "online control"
    ],
    "image_url": null,
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-09-11-015",
      "title": "arXiv preprint 2609.11775",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2609.11775",
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      "source_type": "primary_research",
      "is_primary_source": true,
      "published_at": "2026-09-10T12:29:00.000-04:00",
      "accessed_at": "2026-09-11T08:25:00.000-04:00",
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  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
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  "cite_this_report": {
    "title": "A Robot Hand Began Writing After Eighteen Seconds",
    "publisher": "The Machine Press",
    "published_at": "2026-09-11T09:00:00.000-04:00",
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