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  2. Ragnarok: The Age of Fire and Gravel - Wikipedia

    en.wikipedia.org/wiki/Ragnarok:_The_Age_of_Fire...

    In Ragnarok, Donnelly argues that an enormous comet hit the earth 12,000 years ago, resulting in widespread fires, floods, poisonous gases, and unusually vicious and prolonged winters. The catastrophe destroyed a more advanced civilization, forcing its terrified population to seek shelter in caves.

  3. Abyss (magazine) - Wikipedia

    en.wikipedia.org/wiki/Abyss_(magazine)

    Abyss was a bimonthly zine-type magazine [2] focusing on fantasy role-playing games including New Ysgarth Rules (also published by Ragnarok Games) and Dungeons & Dragons. [3] Each issue was twenty offset pages in length, with a reported circulation of about 175. [ 2 ]

  4. Mass deacidification - Wikipedia

    en.wikipedia.org/wiki/Mass_deacidification

    The actual cost per book was $11.70. [28] Finally, a 2003 cost comparison with reformatting options per volume yielded $125 for microfilming, $50 for scanning and minimal indexing and, based on a New York Public Library project, $16.20 for deacidification. [6] However, already in 2004 Google Books was able to scan for only $10-$20 per book. [29]

  5. A conservation technician examining an artwork under a microscope at the Indianapolis Museum of Art. The conservation and restoration of books, manuscripts, documents, and ephemera is an activity dedicated to extending the life of items of historical and personal value made primarily from paper, parchment, and leather.

  6. Book - Wikipedia

    en.wikipedia.org/wiki/Book

    A book is a medium for recording information in the form of writing or images. Modern books are typically in codex format, composed of many pages that are bound together and protected by a cover; they were preceded by several earlier formats, including the scroll and the tablet.

  7. Aqua regia - Wikipedia

    en.wikipedia.org/wiki/Aqua_regia

    Aqua regia (/ ˈ r eɪ ɡ i ə, ˈ r iː dʒ i ə /; from Latin, "regal water" or "royal water") is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. [ b ] Aqua regia is a fuming liquid.

  8. Kipp's apparatus - Wikipedia

    en.wikipedia.org/wiki/Kipp's_apparatus

    Although the acid is free to flow down through the tube into the bottom chamber, it is prevented from rising there by the pressure of the gas contained above it, which is able to leave the apparatus only by a stopcock near the top of the middle chamber.

  9. Swan neck flask - Wikipedia

    en.wikipedia.org/wiki/Swan_neck_flask

    The contents of the flask thus remain free of microbes, a property showcased by French microbiologist Louis Pasteur in nineteenth century experiments used to support germ theory as the cause of fermentation over spontaneous generation from bad air . [1] [2] [3] Bottle en col de cygne (Swan neck bottle) used by Louis Pasteur

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