Head lice / louse
The head louse (Pediculus humanus capitis) is an obligate ectoparasite of humans that causes head lice infestation (pediculosis capitis).[1]
Head lice are wingless insects spending their entire lives on the human scalp and feeding exclusively on human blood.[1] Humans are the only known hosts of this specific parasite, while chimpanzees host a closely related species, Pediculus schaeffi. Other species of lice infest most orders of mammals and all orders of birds,[1] as well as other parts of the human body.
Lice differ from other hematophagic ectoparasites such as fleas in spending their entire lifecycle on a host.[2] Head lice cannot fly, and their short, stumpy legs render them incapable of jumping, or even walking efficiently on flat surfaces.[2]
The non-disease-carrying head louse differs from the related disease-carrying body louse (Pediculus humanus humanus) in preferring to attach eggs to scalp hair rather than to clothing. The two subspecies are morphologically almost identical, but do not normally interbreed, although they will do so in laboratory conditions. From genetic studies, they are thought to have diverged as subspecies about 30,000–110,000 years ago, when many humans began to wear a significant amount of clothing.[3][4] A much more distantly related species of hair-clinging louse, the pubic or crab louse (Pthirus pubis), also infests humans. It is visually different from the other two species and is much closer in appearance to the lice which infest other primates.[5] Lice infestation of any part of the body is known as pediculosis.[6]
Head lice (especially in children) have been, and still are, subject to various eradication campaigns. Unlike body lice, head lice are not the vectors of any known diseases. Except for rare secondary infections that result from scratching at bites, head lice are harmless, and they have been regarded by some as essentially a cosmetic rather than a medical problem. Head lice infestations might be beneficial in helping to foster a natural immune response against lice which helps humans in defense against the far more dangerous body louse, which is capable of transmission of dangerous diseases.[7]
Norman
Norman /ˈnɔːrmən/ is a city in the U.S. state of Oklahoma 20 miles (30 km) south of downtown Oklahoma City in its metropolitan area. The population was 110,925 at the 2010 census.[1] Norman’s estimated population of 120,284 in 2015 makes it the third-largest city in Oklahoma, and the city serves as the county seat of Cleveland County.
Norman was settled during the Land Run of 1889, which opened the former Unassigned Lands of Indian Territory to American pioneer settlement. The city was named in honor of Abner Norman, the area’s initial land surveyor, and was formally incorporated on May 13, 1891. Economically the city has prominent higher education and related research industries, as it is the home to the University of Oklahoma, the largest university in the state, with approximately 30,000 students enrolled. The university is well known for its sporting events by teams under the banner of the nickname “Sooners,” with over 80,000 people routinely attending football games. The university is home to several museums, including the Fred Jones Jr. Museum of Art, which contains the largest collection of French Impressionist art ever given to an American university, as well as the Sam Noble Oklahoma Museum of Natural History.
The National Weather Center, located in Norman, houses a unique collection of university, state, federal, and private sector organizations that work together to improve the understanding of events related to the Earth’s atmosphere. Norman lies within Tornado Alley, a geographic region where tornadic activity is particularly frequent and intense. The Oklahoma City metropolitan area, including Norman, is the most tornado-prone area in the world. The Storm Prediction Center (SPC), a branch of the National Oceanic and Atmospheric Administration (NOAA) is located at the NWC. SPC forecasts severe storm and tornado outbreaks nationwide. Additionally, research is conducted at the co-located National Severe Storms Laboratory (NSSL), which includes field research and operates various experimental weather radars.
In 2008, CNN‘s Money Magazine ranked Norman as the sixth best small city within the United States to live in.