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    "title": "The Principle of Relativity: Selected Papers by Einstein",
    "author": "Albert Einstein",
    "date": "selected papers, 1905-1916",
    "summary": "This editorial selection gathers papers in which Einstein formulates decisive stages of relativity. It allows scientific arguments to be followed in published form while remaining a section of an anthology rather than a book he composed.",
    "learning": "Read a scientific paper within its chronology, distinguish technical demonstration from popular exposition, and preserve each text’s identity inside the anthology.",
    "long_summary": "The papers address the electrodynamics of moving bodies, the inertia of energy, and developments connected with gravitation. Definitions, derivations, and experimental consequences show a theory under construction at a technical level unlike popular expositions.\n\nThe volume title belongs to a collective carrier. Only items identified as Einstein’s papers are attributed to him, and editorial proximity does not create a single authored work. Chronology and provenance remain essential for each piece.",
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    "material_world_label": "World of the world wars, 1914-1945",
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        "technology": "Electricity, internal combustion, steel, aviation, radio, cinema, and mass production transform civilian life and warfare.",
        "science": "Relativity, quantum physics, chemistry, psychology, and genetics reshape knowledge within powerful institutions that are sometimes militarized.",
        "medicine": "X-rays, surgery, transfusion, antisepsis, and early antibiotics save more lives without universal access.",
        "transport": "Rail, cars, trams, ocean liners, and aircraft coexist. Armies mechanize mobility rapidly.",
        "agriculture": "Tractors, fertilizers, and breeding advance; rationing, blockade, and requisition expose fragile supplies.",
        "communication": "Telephone, telegraph, radio, newsreels, and newspapers reach mass audiences; propaganda and censorship use the same networks.",
        "clothing": "Suits, shorter dresses, coats, and hats coexist with uniforms and workwear. Shortages simplify cuts and materials."
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        },
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            "title": "Clothing, women and men",
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