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  2. List of presidents of the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_Presidents_of_the...

    Near the end of his presidency, Johnson rejoined the Democratic Party. [42] ^ Chester A. Arthur succeeded to the presidency upon the death of James A. Garfield. [47] ^ Theodore Roosevelt succeeded to the presidency upon the death of William McKinley. [52] ^ Calvin Coolidge succeeded to the presidency upon the death of Warren G. Harding.

  3. Water fluoridation in the United States - Wikipedia

    en.wikipedia.org/wiki/Water_fluoridation_in_the...

    Fluoridation became an official policy of the U.S. Public Health Service by 1951, and by 1960 water fluoridation had become widely used in the U.S., reaching about 50 million people. [2] By 2006, 69.2% of the U.S. population on public water systems were receiving fluoridated water, amounting to 61.5% of the total U.S. population. [3]

  4. List of states and territories of the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_states_and...

    A map of the United States showing its 50 states, federal district and five inhabited territories. Alaska, Hawaii, and the territories are shown at different scales, and the Aleutian Islands and the uninhabited northwestern Hawaiian Islands are omitted from this map. This article is part of a series on.

  5. Catalytic heater - Wikipedia

    en.wikipedia.org/wiki/Catalytic_heater

    A catalytic heater is a flameless heater which relies on catalyzed chemical reactions to break down molecules and produce califaction (heat). [1] When the catalyst, fuel (e.g., natural gas), and oxygen combine together, they react at a low enough temperature that a flame is not produced. This process keeps repeating itself until either oxygen ...

  6. Tankless water heating - Wikipedia

    en.wikipedia.org/wiki/Tankless_water_heating

    Gas water heaters have an exhaust vent or one to two exhaust pipes on the top, and still require electric power for electronics, sensing and ignition. A three-phase, 21 kW, 400-volt tankless water heater in Europe, with new European color coding for three-phase power. There are also heaters that use several single-phase circuits instead.

  7. Aquarium heater - Wikipedia

    en.wikipedia.org/wiki/Aquarium_heater

    An aquarium heater is a device used in the fishkeeping hobby to warm the temperature of water in aquariums. [1] Most tropical freshwater and marine aquariums are maintained at temperatures that range from 22 to 30 °C (71-86 °F). [1] [2] [3] The types include glass immersion heaters and undergravel heating. There are also heating mats that may ...

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