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  2. History of water supply and sanitation - Wikipedia

    en.wikipedia.org/wiki/History_of_water_supply...

    The history of water supply and sanitation is one of a logistical challenge to provide clean water and sanitation systems since the dawn of civilization. Where water resources, infrastructure or sanitation systems were insufficient, diseases spread and people fell sick or died prematurely. Astronaut Jack Lousma taking a shower in space, 1974.

  3. Water storage - Wikipedia

    en.wikipedia.org/wiki/Water_storage

    Water storage. Water storage is a broad term referring to storage of both potable water for consumption, and non potable water for use in agriculture. In both developing countries and some developed countries found in tropical climates, there is a need to store potable drinking water during the dry season. In agriculture water storage, water is ...

  4. California water wars - Wikipedia

    en.wikipedia.org/wiki/California_water_wars

    The California Water Wars were a series of political conflicts between the city of Los Angeles and farmers and ranchers in the Owens Valley of Eastern California over water rights . As Los Angeles expanded during the late 19th century, it began outgrowing its water supply. Fred Eaton, mayor of Los Angeles, promoted a plan to take water from ...

  5. Water purification - Wikipedia

    en.wikipedia.org/wiki/Water_purification

    Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids, and gases from water. The goal is to produce water that is fit for specific purposes. Most water is purified and disinfected for human consumption ( drinking water ), but water purification may also be carried out for a variety of ...

  6. PDF Solutions - Wikipedia

    en.wikipedia.org/wiki/PDF_Solutions

    US$ 165.8 million (2023) Website. www .pdf .com. PDF Solutions, Inc. is an American multinational software and engineering services company based in Santa Clara, California. The company is listed in the Nasdaq stock exchange and in 2023 generated revenues of US$165.8 million. [ 1]

  7. Hydroelectricity - Wikipedia

    en.wikipedia.org/wiki/Hydroelectricity

    When the demand becomes greater, water is released back into the lower reservoir through a turbine. In 2021 pumped-storage schemes provided almost 85% of the world's 190 GW of grid energy storage [1] and improve the daily capacity factor of the generation system. Pumped storage is not an energy source, and appears as a negative number in ...

  8. History of mathematics - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematics

    The history of mathematics deals with the origin of discoveries in mathematics and the mathematical methods and notation of the past. Before the modern age and the worldwide spread of knowledge, written examples of new mathematical developments have come to light only in a few locales. From 3000 BC the Mesopotamian states of Sumer, Akkad and ...

  9. Timeline of mathematics - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_mathematics

    This is a timeline of pure and applied mathematics history.It is divided here into three stages, corresponding to stages in the development of mathematical notation: a "rhetorical" stage in which calculations are described purely by words, a "syncopated" stage in which quantities and common algebraic operations are beginning to be represented by symbolic abbreviations, and finally a "symbolic ...

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