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    "story_id": "mp-2026-07-18-004",
    "source_story_id": "tmp-story-biological-puncture-tradeoffs",
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    "headline": "A Thorn and a Tooth Solve the Same Mechanical Bargain",
    "slug": "a-thorn-and-a-tooth-solve-the-same-mechanical-bargain",
    "dek": "Across 143 species, sharper puncture tools traded penetration efficiency against resistance to bending and buckling.",
    "summary": "Across 143 species, sharper puncture tools traded penetration efficiency against resistance to bending and buckling.",
    "body_text": "Illinois researchers compared fangs, spines, tusks, thorns, teeth, and other biological puncture tools. Their models show why no single shape dominates: narrow tips enter efficiently but need geometry and material support to survive sideways loads. Rose prickles, scorpion stingers, and shark teeth were among high-performing compromises. The study is comparative mechanics, not a claim that the sampled structures are interchangeable.",
    "why_it_matters": "Across 143 species, sharper puncture tools traded penetration efficiency against resistance to bending and buckling.",
    "limitations": [
      "The study is comparative mechanics, not a claim that the sampled structures are interchangeable."
    ],
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    "first_published_at": "2026-07-18T09:00:00.000-04:00",
    "modified_at": "2026-07-18T09:00:00.000-04:00",
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        "qualification": "The study is comparative mechanics, not a claim that the sampled structures are interchangeable."
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    "tags": [
      "biomechanics",
      "puncture",
      "evolution"
    ],
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    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-07-18-004",
      "title": "Illinois via Newswise: Biological puncture-tool performance",
      "publisher": "University of Illinois Urbana-Champaign via Newswise",
      "url": "https://www.newswise.com/articles/from-cactus-thorns-to-dinosaur-teeth-study-analyzes-biological-puncture-tool-performance",
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      "is_primary_source": true,
      "published_at": "2026-07-17T18:25:00.000-04:00",
      "accessed_at": "2026-07-18T08:25:00.000-04:00",
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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 Thorn and a Tooth Solve the Same Mechanical Bargain",
    "publisher": "The Machine Press",
    "published_at": "2026-07-18T09:00:00.000-04:00",
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