Hair is a filamentous outgrowth of the skin found only in mammals. In some species it is absent at certain stages of life. It projects from the epidermis, though it grows from follicles deep in the dermis. So-called "hairs" (trichomes) are also found on plants. The projections on insects and spiders are actually bristles. The hair of non-human species is commonly referred to as fur. There are varieties of cats, dogs, and mice bred to have little or no visible hair. Hair serves a number of different functions. It provides insula ...

Including:

• Hair - Human hair
• Hair - Structure
• Hair - Types of hair
• Hair - Hair change with aging
• Hair - Androgenic hair
• Hair - Other information

Read more here: » Hair: Encyclopedia - Hair

See also:

Hair, Hair - Human hair, Hair - Structure, Hair - Types of hair, Hair - Hair change with aging, Hair - Androgenic hair, Hair - Other information

Read more here: » Hair: Encyclopedia II - Hair - Hair change with aging

Typically, humans have the longest hair on the top of the head, with shorter hair on the eyelids and eyebrows. The axillary (armpit) hair and pubic hair serves as lubrication during rubbing. Sometimes, the term body hair is used, to distinguish it from hair on the head. Individual hairs alternate periods of growth and dormancy. During the growth portion of the cycle, hair follicles are long and bulbous, and the hair advances outward at about a third of a millimeter per day. After three to six months, body hair growth stops (the ...

See also:

Hair, Hair - Human hair, Hair - Structure, Hair - Types of hair, Hair - Hair change with aging, Hair - Androgenic hair, Hair - Other information

Read more here: » Hair: Encyclopedia II - Hair - Human hair

Human beings have many variations in hair color and texture. Hair color is the result of pigmentation due to the presence of the chemicals of melanin. In general, the more melanin, the darker the hair color. In general, the color of children's and adult's hair varies from pale yellow to deep black. The ethnic distribution of colors has historically varied by geographic area. For example, deep brown and black prevail in the Middle East, North Africa, and Mediterranean Europe, and even darker shades occur in East Asia, Sou ...

Including:

• Hair color - Effects of aging on hair color
• Hair color - Genetics
• Hair color - Medical conditions affecting hair color
• Hair color - Archaeological Hair

Read more here: » Hair color: Encyclopedia - Hair color

Blond (feminine, blonde) is a hair color found in certain mammals characterised by low levels of the dark pigment eumelanin and higher levels of the pale pigment phæomelanin, in common with red hair. From darkest ash blond to pale blond, the various hues of blondness colour about 2% of the world's population. The resultant visible hue depends on various factors, but always has some sort of yellowish colour, going from the very pale blond caused by a patchy, scarce distribution of pigment, to reddish "strawberry" blond c ...

Including:

• Blond - Etymology spelling and grammar
• Blond - Distribution among humans
• Blond - Instinctive and cultural reactions
• Blond - Theory of the Disappearing Blonds
• Blond - External link

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Alopecia areata ("baldness in spots") is a form of hair loss from areas of the body, usually from the scalp. Because it causes bald spots on the head especially in the first stages, it is also called spot baldness. Hair loss can extend to eyebrows, eyelashes and facial and nasal hair and create more bald spots elsewhere in the body. Alopecia areata monolocularis describes baldness in only one spot, alopecia areata multilocularis refers to multiple areas of hair loss. If the patient loses all the hair ...

Including:

• Alopecia areata - Diagnosis
• Alopecia areata - Treatment
• Alopecia areata - Prognosis

Read more here: » Alopecia areata: Encyclopedia - Alopecia areata

Since the 1980s, drug therapy has increasingly become a realistic management option for baldness for men and women, as increased understanding of the mechanisms of normal and pathologic hair growth has pointed the way to improved treatments. Scientifically proven baldness treatments continue to be an area of research that receives a large amount of funding. More than half of men are affected by male pattern baldness by age 50, and baldness treatment is estimated to be a US $1 billion per year industry.^Including:

• Baldness treatments - General concerns
• Baldness treatments - Propecia
• Baldness treatments - Possible health concerns
• Baldness treatments - Propecia's effects in detail
• Baldness treatments - Revivogen
• Baldness treatments - Antiandrogens
• Baldness treatments - Minoxidil
• Baldness treatments - Copper peptides
• Baldness treatments - Ketoconazole
• Baldness treatments - Diet and Lifestyle
• Baldness treatments - Others
• Baldness treatments - Hair transplant
• Baldness treatments - Hair multiplication future treatment

Read more here: » Baldness treatments: Encyclopedia - Baldness treatments

Alopecia, commonly known as baldness, is a set of disorders which involves the state of lacking hair where it would normally grow, especially on the head. The most common form of baldness is a progressive hair-thinning condition that occurs in adult humans and other primate species. Nonetheless, the severity and nature of condition can vary greatly; it ranges from male and female pattern alopecia (alopecia androgenetica), to alopecia areata, which involves the loss of some of the hair from the head, alopecia totalis, which invo ...

Including:

• Baldness - Mechanism of male pattern baldness
• Baldness - Evolutionary theories of male pattern baldness
• Baldness - Approaches to baldness
• Baldness - Psychological implications
• Baldness - Preventing and reversing hair loss
• Baldness - Concealing hair loss
• Baldness - Embracing baldness
• Baldness - Common baldness myths
• Baldness - Trivia
• Baldness - Reference

Read more here: » Baldness: Encyclopedia - Baldness

Dreadlocks, sometimes called simply dreads or locks, are matted ropes of hair which will form by themselves if the hair is allowed to grow naturally without the use of brushes, combs, razors or scissors for a long period of time. Dreadlocks are a universal phenomenon and through the ages, people of various cultures have worn dreadlocks. It can be said that what are known today as "dreadlocks" are one of the oldest and most universal hairstyles known. Dreadlocks - History. The first know ...

Including:

• Dreadlocks - History
• Dreadlocks - Meaning and popularity
• Dreadlocks - Religious or spiritual convictions
• Dreadlocks - Ethnic pride or political statements
• Dreadlocks - In popular culture

Read more here: » Dreadlocks: Encyclopedia - Dreadlocks

The Age of Aquarius (starting around the 27th century) is one of the twelve astrological ages. According to different astrologers' calculations, probable approximated dates for entering the Age of Aquarius may be A.D. 2638 (Elsa M. Glover), A.D. 2654 (Max Heindel) or A.D. 2680 (Shepherd Simpson); yet all of them quite close to each other, taken into consideration that they are calculations about an event taking place six centuries from now. In 1929, the International Astronomical Union defined the edges of the 88 official constellations. The edge established between Pisces and Aquarius locates t ...

Including:

• Age of Aquarius - Overview
• Age of Aquarius - Popular culture references
• Age of Aquarius - Christian vision

Read more here: » Age of Aquarius: Encyclopedia - Age of Aquarius

Biotin, also known as vitamin H or B7 and C10H16N2O3S (Biotin; Coenzyme R, Biopeiderm), is a water-soluble B-complex vitamin which is composed of an ureido ring fused with a tetrahydrothiophene ring. A valeric acid substituent is attached to one of the carbon atoms of the tetrahydrothiophene ring. Biotin is important in the catalysis of essential metabolic reactions to synthesize fatty acids, in gluconeogenesis, and to metabolize leucine. It is commonly found in pyr ...

Including:

• Biotin - General overview
• Biotin - Uses
• Biotin - Hair problems
• Biotin - Cradle cap seborrheic dermatitis
• Biotin - Diabetes
• Biotin - Biotin deficiency
• Biotin - Biochemistry

Read more here: » Biotin: Encyclopedia - Biotin

In zootomy and dermatology, skin is an organ of the integumentary system composed of a layer of tissues that protect underlying muscles and organs. As the interface with the surroundings, it plays the most important role in protecting against pathogens. Its other main functions are insulation and temperature regulation, sensation and vitamin D and B synthesis. Skin has pigmentation, provided by melanocytes, which absorbs some of the potentially dangerous radiation in sunlight. It also contains DNA repair enzymes which reverse U ...

Including:

• Skin - Layers
• Skin - Types
• Skin - Functions
• Skin - Hygiene
• Skin - Aging and disease

Read more here: » Skin: Encyclopedia - Skin

Ageing or aging is the process of becoming older. This article focuses on the social, cultural, and economic effects of ageing. The biology of ageing is treated in detail in senescence. Ageing is an important part of all human societies reflecting the biological changes that occur, but also reflecting cultural and societal conventions. Age is usually, but wholly arbitrarily, measured in years and a p ...

Including:

• Ageing - Senescence: the biology of ageing
• Ageing - Dividing the lifespan
• Ageing - Age and the law
• Ageing - Economics and marketing of ageing
• Ageing - Cultural variations
• Ageing - Global ageing trends
• Ageing - Reference

Read more here: » Ageing: Encyclopedia - Ageing

Usher syndrome is a genetic disease causing deaf-blindness. It is essentially progressive retinitis pigmentosa combined with congenital hearing impairment. It is almost always inherited in an autosomal recessive pattern and is estimated to occur in 1 in 10,000 people. Whilst this is a rare genetic condition, it represents the major cause of syndromic deafness with blindness. The condition gets its name from British ophthalmologist, C.H. Usher, who in 1914 wrote a paper describing several cases in which the link between conge ...

Including:

• Usher syndrome - Usher syndrome I
• Usher syndrome - Usher syndrome II
• Usher syndrome - Usher syndrome III

Read more here: » Usher syndrome: Encyclopedia - Usher syndrome

A razor is an edge tool (primarily, used in shaving). Razor - Early razors. In its simplest form, a razor is a steel blade attached to a handle. Razors have been identified from Bronze Age Britain. These are made of bronze, generally oval in shape with a small tang protruding from one of the short ends. Straight razors (also called cut-throat razors) with open steel blades were the most common before the 20th century—and, in many countries, until the 1950s. They are now used chiefly by barbers. ...

Including:

• Razor - Early razors
• Razor - Safety razor
• Razor - Electric razor
• Razor - Other razors
• Razor - Figurative uses

Read more here: » Razor: Encyclopedia - Razor

Hippie (also hippy) is a term originally used to describe some of the rebellious youth of the 1960s and 1970s. The word hippie was popularized by the late San Francisco Chronicle columnist Herb Caen. Caen's articles were always written with the help of notes and letters from his San Francisco fan base. He is also credited as among the first to include the words beatnik and yuppie in his column. Though not a cohesive cultural movement with manifestos and leaders, some hippies expressed their desire for change with ...

Including:

• Hippie - Origins
• Hippie - Politics
• Hippie - Drugs
• Hippie - Legacy
• Hippie - Characteristics
• Hippie - Pejorative connotations
• Hippie - Hippy
• Hippie - European countercultures after WW2
• Hippie - Bibliography

Read more here: » Hippie: Encyclopedia - Hippie

Androgen insensitivity syndrome (AIS, or "Androgen resistance syndrome") is a set of disorders of sexual differentiation that results from mutations of the gene encoding the androgen receptor. It has also been called androgen resistance in the medical literature. The nature of the resulting problem varies according to the structure and sensitivity of the abnormal receptor. Most of the forms of AIS involve variable degrees of undervirilization and/or infertility in XY persons of either sex. A woman with complete androgen ...

Including:

• Androgen insensitivity syndrome - Genetics inheritance and incidence
• Androgen insensitivity syndrome - Normal function of androgens and the androgen receptor
• Androgen insensitivity syndrome - Prenatal effects of testosterone in 46XY fetus
• Androgen insensitivity syndrome - Early postnatal effects of testosterone in 46XY infants
• Androgen insensitivity syndrome - Pubertal effects of testosterone in 46XY children
• Androgen insensitivity syndrome - Problems produced by androgen insensitivity
• Androgen insensitivity syndrome - 1. Complete AIS
• Androgen insensitivity syndrome - 2. Incomplete or partial AIS
• Androgen insensitivity syndrome - 3. Reifenstein syndrome
• Androgen insensitivity syndrome - 4. Infertile male syndrome
• Androgen insensitivity syndrome - 5. Undervirilized fertile male syndrome
• Androgen insensitivity syndrome - 6. X-linked spinal and bulbar atrophy syndrome

Read more here: » Androgen insensitivity syndrome: Encyclopedia - Androgen insensitivity syndrome

In Greek mythology, the Gorgons ("terrible" or, according to some, "loud-roaring") were vicious female monsters with sharp fangs and hair of living, venomous snakes. Gorgon - Classical tradition. Gorgons are sometimes depicted as having wings of gold, brazen claws, and the tusks of boars. According to the myths, seeing the face of a Gorgon turned the viewer to stone. Homer speaks of only one Gorgon, whose head is represented in the Iliad as fixed in the centre of the aegis of Zeus: "About her s ...

Including:

• Gorgon - Classical tradition
• Gorgon - Perseus and Medusa
• Gorgon - Protective and healing powers
• Gorgon - Origins
• Gorgon - Gorgons in modern culture

Read more here: » Gorgon: Encyclopedia - Gorgon

In anatomy, the head of an animal is the anterior part (from anatomical position) that comprises the mouth, the brain and various sensory organs (e.g. organs of sight, hearing, smell and taste). Head - Anatomy. The front (ventrum) of the head, where the eyes and ears and mouth are located, is called the face. The area above the eyes is called the forehead (the front of the head). Below the mouth is the chin. Younger aged humans and some older humans heads have a continuing growing layer ...

Including:

• Head - Anatomy
• Head - Human head anatomy
• Head - The face
• Head - Cultural import
• Head - Clothing
• Head - Pseudoscientific study of the human head

Read more here: » Head: Encyclopedia - Head

A change in hair color typically occurs naturally as people age, usually turning their hair from its natural color to gray, then to white. More than 40 percent of Americans have some gray hair by their fortieth birthday but grey hairs can appear as early as the teens and twenties for some, or even in childhood. The determination of when someone begins graying, whether it comes with aging or prematurely, seems to be almost entirely based on genetics. Sometimes people are born with gray ha ...

See also:

Hair color, Hair color - Effects of aging on hair color, Hair color - Genetics, Hair color - Medical conditions affecting hair color, Hair color - Archaeological Hair

Read more here: » Hair color: Encyclopedia II - Hair color - Effects of aging on hair color