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    "story_id": "mp-2026-09-04-001",
    "source_story_id": "tmp-lead-principia-relational-physics",
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    "headline": "The Video Looked Real Until the Second Object Moved",
    "slug": "the-video-looked-real-until-the-second-object-moved",
    "dek": "Six leading generators scored near 0.8 on a familiar video benchmark, yet none cleared 0.42 when paired motions had to obey the same physical law.",
    "summary": "Six leading generators scored near 0.8 on a familiar video benchmark, yet none cleared 0.42 when paired motions had to obey the same physical law.",
    "body_text": "Principia replaces camera-dependent absolute measurements with relationships between two objects in one controlled scene. Its eight tests span gravity, restitution, friction, rotational inertia, projectile motion, momentum, pendulums and mass-spring oscillation, allowing violations to be measured directly in image space without knowing the frame rate, object scale or camera calibration. Across thousands of generations from six systems, the authors report that no model exceeded 0.42 despite scores around 0.8 on VBench; vision-language models also struggled to identify the violations, with the best reaching 67% accuracy and most near chance. These are benchmark results reported in a new preprint, not an independent audit of every video model.",
    "why_it_matters": "Six leading generators scored near 0.8 on a familiar video benchmark, yet none cleared 0.42 when paired motions had to obey the same physical law.",
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      "These are benchmark results reported in a new preprint, not an independent audit of every video model."
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        "text": "Six leading generators scored near 0.8 on a familiar video benchmark, yet none cleared 0.42 when paired motions had to obey the same physical law.",
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    "tags": [
      "video generation",
      "physical reasoning",
      "benchmarks"
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      "source_id": "source-2026-09-04-001",
      "title": "arXiv preprint 2609.04200",
      "publisher": "arXiv",
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      "published_at": "2026-09-03T13:59:50.000-04:00",
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    "title": "The Video Looked Real Until the Second Object Moved",
    "publisher": "The Machine Press",
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