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  2. History of PDF - Wikipedia

    en.wikipedia.org/wiki/History_of_PDF

    History of PDF. The Portable Document Format (PDF) was created by Adobe Systems, introduced at the Windows and OS/2 Conference in January 1993 and remained a proprietary format until it was released as an open standard in 2008. Since then, it has been under the control of an International Organization for Standardization (ISO) committee of ...

  3. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    HTML 4.01 Specification since PDF 1.5; HTML 2.0 since 1.2 Forms Data Format (FDF) based on PDF, uses the same syntax and has essentially the same file structure, but is much simpler than PDF since the body of an FDF document consists of only one required object. Forms Data Format is defined in the PDF specification (since PDF 1.2).

  4. Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/Main_Page

    It was formed approximately 4.5 billion years ago, is a terrestrial planet and is the second smallest of the Solar System 's planets with a diameter of 6,779 km (4,212 mi). A Martian solar day ( sol) is 24.5 hours and a Martian solar year is 1.88 Earth years (687 Earth days). Mars has two small and irregular natural satellites: Phobos and Deimos.

  5. pleasure. giddiness. nervous excitement. euphoria. Decreases in serotonin can fuel feelings of infatuation. Sex hormones, such as testosterone and estrogen, also play a part by boosting libido and ...

  6. When to Say ‘I Love You’ Varies: Why, How to Tell, More

    www.healthline.com/.../when-to-say-i-love-you

    It’s never wrong to take time to consider your own feelings when a partner says, “I love you.”. Instead of replying in kind before you truly mean it, consider trying out one of these starter ...

  7. Google Scholar - Wikipedia

    en.wikipedia.org/wiki/Google_Scholar

    Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. . Released in beta in November 2004, the Google Scholar index includes peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other ...

  8. This code -- combined with the pill’s size, color, and shape -- helps you tell it apart from other medications. A pill’s imprint code can be made up of any single letter or number, or any ...

  9. Z-Library - Wikipedia

    en.wikipedia.org/wiki/Z-Library

    Z-Library (abbreviated as z-lib, formerly BookFinder) is a shadow library project for file-sharing access to scholarly journal articles, academic texts and general-interest books. It began as a mirror of Library Genesis, but has since expanded dramatically. [6] [7]