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    "headline": "Ten Thousand Hours of Video Became a Robot Simulator",
    "slug": "ten-thousand-hours-of-video-became-a-robot-simulator",
    "dek": "WorldLine separated transferable visual dynamics from action grounding across incompatible robot bodies.",
    "summary": "WorldLine separated transferable visual dynamics from action grounding across incompatible robot bodies.",
    "body_text": "WorldLine learns manipulation dynamics from more than 10,000 hours of action-free robot video, then grounds those dynamics with over 2,000 hours of action trajectories spanning more than ten embodiments. An image-space action representation provides a shared control interface, while failure-enriched and multi-view training target interaction fidelity. The authors report 74% mean trajectory-success prediction across RoboTwin and AgiBot, and gains of up to 21.4 percentage points when its rollouts guide tasks without RoboTwin training or adaptation. Those are benchmark results, not a substitute for hardware safety checks.",
    "why_it_matters": "WorldLine separated transferable visual dynamics from action grounding across incompatible robot bodies.",
    "limitations": [
      "Those are benchmark results, not a substitute for hardware safety checks."
    ],
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    "first_published_at": "2026-09-30T09:00:00.000-04:00",
    "modified_at": "2026-09-30T09:02:00.000-04:00",
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        "text": "WorldLine separated transferable visual dynamics from action grounding across incompatible robot bodies.",
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        "qualification": "Those are benchmark results, not a substitute for hardware safety checks."
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    "tags": [
      "visual simulation",
      "robot planning",
      "cross-embodiment learning"
    ],
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  "sources": [
    {
      "source_id": "source-2026-09-30-013",
      "title": "arXiv preprint 2609.38059",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2609.38059",
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      "published_at": "2026-09-29T13:26:22.000-04:00",
      "accessed_at": "2026-09-30T08:24:00.000-04:00",
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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": "Ten Thousand Hours of Video Became a Robot Simulator",
    "publisher": "The Machine Press",
    "published_at": "2026-09-30T09:00:00.000-04:00",
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