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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.
Obsolete technology Replacement Still used for Bathing machine: No longer required due to changing social standards of morality Hourglass: Clock: Tasks where a fixed amount of time can be measured with a low-tech solution: Exposure time tracker in saunas (where electronics might be damaged by the heat or ultraviolet light); retro kitchen timers, board games, other short-term timers.
A PDF file is organized using ASCII characters, except for certain elements that may have binary content. The file starts with a header containing a magic number (as a readable string) and the version of the format, for example %PDF-1.7. The format is a subset of a COS ("Carousel" Object Structure) format. [24]
Supports a range of annotation types. Annotations are stored separately from the unmodified PDF file, or (since version 0.15 with Poppler 0.20) can be saved in the document as standard PDF annotations. Evince: GNU GPL: Yes Yes Default PDF and file viewer for GNOME; replaces GPdf. Supports addition and removal (since v3.14), of basic text note ...
1902 – Arthur Korn devises practical telephotography technology (reduction of photographic images to signals that can be transmitted by wire to other locations).Wire-Photos are in wide use in Europe by 1910, and transmitted to other continents by 1922. 1907 – The Autochrome plate is introduced. It becomes the first commercially successful ...
The Internet Archive stated in 2013 that a digital dark age is present, and one of their goals is to prevent digital materials from disappearing into the past. [5]Vinton Cerf, Vice President of Google, showed his concerns about data preservation in the annual meeting of the American Association for the Advancement of Science in 2015: "As the way that we store information about ourselves ...
The three-age system does not accurately describe the technology history of groups outside of Eurasia, and does not apply at all in the case of some isolated populations, such as the Spinifex People, the Sentinelese, and various Amazonian tribes, which still make use of Stone Age technology, and have not developed agricultural or metal ...
The oldest and largest known qanat is in the Iranian city of Gonabad; after 2,700 years, it still provides drinking and agricultural water to nearly 40,000 people. [22] It was designed to carry water from underground sources to desert areas for agricultural and population growth.