Mana Pools National Park is a 219,600 ha wildlife conservation area and national park in northern Zimbabwe. It is a region of the lower Zambezi River in Zimbabwe where the flood plain turns into a broad expanse of lakes after each rainy season.As the lakes gradually dry up and recede, the region attracts many large animals in search of water, making it one of Africa's …

Vernal pools, also called vernal ponds or ephemeral pools, are seasonal pools of water that provide habitat for distinctive plants and animals.They are considered to be a distinctive type of wetland usually devoid of fish, and thus allow the safe development of natal amphibian and insect species unable to withstand competition or predation by fish. . Certain tropical fish lineages …

1282 – zmarł Michał VIII Paleolog (na portrecie), cesarz Nicei i odnowiciel Cesarstwa Bizantyńskiego po odbiciu Konstantynopola od łacinników, protoplasta dynastii Paleologów; dzieje jej upadku przedstawił fiński pisarz Mika Waltari w powieści Czarny Anioł; tegoż dnia w boju zginął Llywelyn ap Gruffydd, ostatni książę niepodległej Walii przed jej podbojem przez króla Anglii ...

A swimming pool, swimming bath, wading pool, paddling pool, or simply pool, is a structure designed to hold water to enable swimming or other leisure activities. Pools can be built into the ground (in-ground pools) or built above ground (as a freestanding construction or as part of a building or other larger structure), and may be found as a feature aboard ocean-liners and …

Polen-Litouwen of het Pools-Litouwse Gemenebest (Pools: Rzeczpospolita Korony Polskiej i Wielkiego Księstwa Litewskiego, letterlijk: Republiek van de Poolse Kroon en Grootvorstendom Litouwen) was een staat in Oost-Europa die bestond van 1569 tot 1795.Het Pools-Litouwse Gemenebest ontstond door het omvormen van de personele unie van het koninkrijk Polen en …

Few universities possessed 50-metre pools, and there was a marked reluctance on the part of municipal authorities to build new public long-course facilities. However, the successful bid to hold the 2012 Summer Olympics in London added impetus to the development of new pools. A number of new venues were completed before and after the Games ...

There are a number of large swimming pools around the world, several of which are artificial lagoons.As of 2019, the Guinness World Record holder for the largest man-made lagoon is Citystars Sharm El Sheikh, located in Sharm El Sheikh, Egypt.. List. Only extant completed artificial swimming pools larger than 1,500 m 2 (16,000 sq ft) for which reliable size sourcing …

Calcium hypochlorite is an inorganic compound with formula Ca(OCl)2. It is the main active ingredient of commercial products called bleaching powder, chlorine powder, or chlorinated lime, used for water treatment and as a bleaching agent. This compound is relatively stable and has greater available chlorine than sodium hypochlorite. It is a white solid, although commercial …

Salt water chlorination is a process that uses dissolved salt (1000–36,000 ppm or 1–36 g/L) for the chlorination of swimming pools and hot tubs.The chlorine generator (also known as salt cell, salt generator, salt chlorinator, or SWG) uses electrolysis in the presence of dissolved salt to produce chlorine gas or its dissolved forms, hypochlorous acid and sodium hypochlorite, which …

In computer programming, a thread pool is a software design pattern for achieving concurrency of execution in a computer program. Often also called a replicated workers or worker-crew model, a thread pool maintains multiple threads waiting for tasks to be allocated for concurrent execution by the supervising program. By maintaining a pool of threads, the model increases …