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  2. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be bought ...

  3. Distilled water - Wikipedia

    en.wikipedia.org/wiki/Distilled_water

    [citation needed] Magnesium, calcium, and other nutrients in water can help to protect against nutritional deficiency. Recommendations for magnesium have been put at a minimum of 10 mg/L with 20–30 mg/L optimum; for calcium a 20 mg/L minimum and a 40–80 mg/L optimum, and a total water hardness (adding magnesium and calcium) of 2–4 mmol/L.

  4. What's the healthiest beverage? The No. 1 pick, according to ...

    www.aol.com/news/whats-healthiest-beverage-no-1...

    Water is definitely the healthiest drink, Rizzo says. “The body is made up of 60% water, and we need to drink water to live. Water plays a role in basically every single process in the body. You ...

  5. Desalination - Wikipedia

    en.wikipedia.org/wiki/Desalination

    Desalination is a process that removes mineral components from saline water. More generally, desalination is the removal of salts and minerals from a substance. [1] One example is soil desalination. This is important for agriculture. It is possible to desalinate saltwater, especially sea water, to produce water for human consumption or irrigation.

  6. Total dissolved solids - Wikipedia

    en.wikipedia.org/wiki/Total_dissolved_solids

    Total dissolved solids ( TDS) is a measure of the dissolved combined content of all inorganic and organic substances present in a liquid in molecular, ionized, or micro-granular ( colloidal sol) suspended form. TDS are often measured in parts per million (ppm). TDS in water can be measured using a digital meter.

  7. Water supply and sanitation in Saudi Arabia - Wikipedia

    en.wikipedia.org/wiki/Water_supply_and...

    In some localities groundwater used for drinking water supply is naturally contaminated with levels of fluoride in excess of the recommended level of 0.7 to 1.2 mg/L. For example, a 1990 study showed that the fluoride level in drinking water in Mecca was 2.5 mg/L. [7] In Riyadh the level of fluoride is reduced far below the recommended level by ...

  8. History of water supply and sanitation - Wikipedia

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

    In Nepal the construction of water conduits like drinking fountains and wells is considered a pious act. A drinking water supply system was developed starting at least as early as 550 AD. This dhunge dhara or hiti system consists of carved stone fountains through which water flows uninterrupted from underground sources. These are supported by ...

  9. Water treatment - Wikipedia

    en.wikipedia.org/wiki/Water_treatment

    Water treatment is any process that improves the quality of water to make it appropriate for a specific end-use. The end use may be drinking, industrial water supply, irrigation, river flow maintenance, water recreation or many other uses, including being safely returned to the environment. Water treatment removes contaminants and undesirable ...

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