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Thursday, 31 December 2020

Wednesday, 30 December 2020

Immune system

  December 30, 2020      No comments   Edit
Immune system.
The immune system is a network of biological processes that protects an organism against disease. It detects and responds to a wide variety of pathogens, from viruses to parasitic worms, as well as cancer cells and objects such as wood splinters, distinguishing them from the organism's own healthy tissue. Many species have two major subsystems of the immune system. The innate immune system provides a preconfigured response to broad groups of situations and stimuli. The adaptive immune system provides a tailored response to each stimulus by learning to recognize molecules it has previously encountered. Both use molecules and cells to perform their functions. Humans have sophisticated defense mechanisms, including the ability to adapt to recognize pathogens more efficiently. Adaptive (or acquired) immunity creates an immunological memory leading to an enhanced response to subsequent encounters with that same pathogen. This process of acquired immunity is the basis of vaccination.

Tuesday, 29 December 2020

Knap Hill

  December 29, 2020      No comments   Edit
Knap Hill.
Knap Hill lies on the northern rim of the Vale of Pewsey, in northern Wiltshire, England, about a mile (1.6 km) north of the village of Alton Priors. At the top of the hill is a causewayed enclosure, a form of Neolithic earthwork that appeared in England from about 3700 BC onwards. These earthworks are characterised by the enclosure of an area with ditches that are interrupted by gaps, or causeways. It is not known what they were used for; they may have been settlements, or meeting places, or ritual sites of some kind. Knap Hill was the first causewayed enclosure to be excavated and identified. In 1908 and 1909 Benjamin and Maud Cunnington spent two summers investigating the site, and Maud Cunnington published two reports of their work, noting that there were several gaps in the ditch and bank surrounding the enclosure. The site has been scheduled as an ancient monument. About a thousand causewayed enclosures have now been found in Europe, including around seventy in Britain.

Monday, 28 December 2020

Louie Nunn

  December 28, 2020      No comments   Edit
Louie Nunn.
Louie Nunn (1924–2004) was the 52nd governor of Kentucky (1967–1971), the only Republican elected to that office between 1947 and 2003. The first Republican county judge in the history of Barren County, Kentucky, he ran for governor in 1963, but lost a close race to his Democratic opponent Ned Breathitt. In 1967, Nunn again ran for governor. After defeating Marlow Cook in the Republican gubernatorial primary, he eked out a victory over Democrat Henry Ward. Despite a Democratic majority in the General Assembly, Nunn was able to enact most of his priorities, including tax increases that funded improvements to the state park system and the construction of a statewide network of mental health centers. His administration was marred by race riots in Louisville and a violent protest against the Vietnam War at the University of Kentucky. Following his term as governor, he lost to Walter "Dee" Huddleston in the 1972 senatorial election, and to John Y. Brown Jr. for governor in 1979.
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