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]
Cocoa
Cocoa is a city in Brevard County, Florida. The population was 17,140 at the 2010 United States Census.[1] It is part of thePalm Bay–Melbourne–Titusville Metropolitan Statistical Area.
Several stories circulate among Cocoa old timers as to how the town got its name. One story says that the mail used to come by river boat and was placed in an empty tin box labeled Baker’s Cocoa. The box was nailed to a piling in the river next to downtown. Additionally, an early hotel in the area, located on the Indian River lagoon, was named Cocoa House.[4]
In 1885, the S. F. Travis Hardware store opened. It is still in business in 2014.[5]
Cocoa’s business district was destroyed by fire in 1890, but soon, significant development began to occur with the extension of the Jacksonville, St. Augustine, and Indian River Railway to Cocoa.[citation needed]
The city was chartered in 1895.[6] In the winter of 1894-1895, Cocoa experienced a second economic setback when the “Great Freeze” destroyed the citrus crop and forced many citrus workers to seek new occupations. According to one source, by 1903, the population of Cocoa had dropped to 382.
During the second decade of the 20th century, population growth and economic development in Cocoa accelerated. The state business directory of 1911-1912 set the population at 550. By 1925, the population was estimated at 1,800. During the Great Depression, the local economy declined and the two local banks failed. Still, by 1930, the population had risen to 2,200.[citation needed]