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]
Bronxville
Bronxville /ˈbrɒŋksvɪl/ is a suburban village in Westchester County, New York, located about 15 miles (24 km) north of midtown Manhattan.[3] It is part of the town of Eastchester. The village comprises 1 square mile (2.5 km2) of land in its entirety, approximately 20% of the town of Eastchester. As of the 2010 U.S. census, Bronxville had a population of 6,323.[4] As of 2014, it was ranked 18th in the state in median income.[5]
Millionaire real-estate and pharmaceutical mogul William Van Duzer Lawrence sparked the development of Bronxville as an affluent suburb of New York City with magnificent homes in a country-like setting.[6] The area, once known as “Underhill’s Crossing”, became “Bronxville” when the village was formally established. The population grew in the second half of the 19th century when railroads allowed commuters from Westchester County to work in New York City.[6] Lawrence’s influence can be seen throughout the community, including the historic Lawrence Park neighborhood, the Houlihan Lawrence Real Estate Corporation, and Lawrence Hospital. John F Kennedy, the president of the United States, also resided here for a time.[7]
The village was home to an arts colony in the early 20th century during which time many noteworthy houses by prominent and casual architects were built.[8] After the Bronx River Parkway was completed in 1925, the Village expanded rapidly with the construction of several apartment buildings and townhouses much of it built by the Lawrence family. As of 1959, they continued to own or manage 97% of the rental market.[9] In both rentals and ownership, the village discouraged and effectively prohibited Jewish residency, earning the name “The Holy Square Mile.”[9]