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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.
High school or senior high school is the education students receive in the final stage of secondary education in the United States. In the United States most high schoolers are ages 13–18 but some ages could be delayed due to birthdays. Most comparable to secondary schools, high schools generally deliver phase three of the ISCED model of ...
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 ...
Water pollution in the United States is a growing problem that became critical in the 19th century with the development of mechanized agriculture, mining, and industry, although laws and regulations introduced in the late 20th century have improved water quality in many water bodies. [ 1] Extensive industrialization and rapid urban growth ...
A water tower is an elevated structure [ 1] supporting a water tank constructed at a height sufficient to pressurize a distribution system for potable water, and to provide emergency storage for fire protection. [ 2] Water towers often operate in conjunction with underground or surface service reservoirs, which store treated water close to ...
The rapid expansion of education past age 14 set the U.S. apart from Europe for much of the 20th century. [ 82] From 1910 to 1940, high schools grew in number and size, reaching out to a broader clientele. In 1910, for example, 9% of Americans had a high school diploma; in 1935, the rate was 40%. [ 190]
The Historic Old Central High School of Duluth, Minnesota, United States, is a local landmark dating to 1892. One of Minnesota's leading examples of Richardsonian Romanesque architecture, it occupies an entire city block and sports a 210-foot (64 m) clock tower. [2] It was listed on the National Register of Historic Places as Duluth Central ...
Secondary education is the last six or seven years of statutory formal education in the United States. It culminates with twelfth grade (age 17–18). Whether it begins with sixth grade (age 11–12) or seventh grade (age 12–13) varies by state and sometimes by school district. [ 1]