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]
Celebration
Celebration is a census-designated place (CDP) and a master-planned community in Osceola County, Florida, United States, located near Walt Disney World Resort and originally developed by The Walt Disney Company. As part of theOrlando–Kissimmee Metropolitan Statistical Area, Celebration’s population was 7,427 at the 2010 census.[3]
Subsequent to founding Celebration, Disney followed its plans[4] to divest most of its control of the town. Several Disney business units continue to occupy the town’s office buildings, and two utility companies, Smart City Telecom and Reedy Creek Energy Services, both operated from Walt Disney World, provide services to the town. The town itself remains directly connected to the Walt Disney World resorts via one of its primary streets, World Drive, which begins near the Magic Kingdom.
Downtown Celebration’s post office was designed by Michael Graves, the adjacent Welcome Center is by Philip Johnson and the Celebration Health building by Robert A. M. Stern.[5] Other nearby buildings are designed by well known architects including: Charles Moore (Preview Center), Graham Gund (Bohemian Hotel), Cesar Pelli (movie theatre), Robert Venturi andDenise Scott Brown (SunTrust Bank).[6]
Response to Celebration has ranged from an early visitor who said it resembled the too-perfect town of “The Stepford Wives“[5]to those who see Celebration as an example of unabashed neo-urbanism.[7]