Human skin color is primarily due to the presence of melanin in the skin. Skin color ranges from almost black to white with a pinkish tinge due to blood vessels underneath. Variation in natural skin color is mainly due to genetics, although the evolutionary causes are not completely certain. According to scientific studies, natural human skin color diversity within populations is highest in Sub-Saharan African populations, with skin reflectance values ranging from 19 to 46 (med. 31) compared with European and East Asian populations which have skin reflectance values of 62 to 69 and 50 to 59 respectively. The term "range" is loosely defined in this case, as African albinos have obviously not been taken into consideration when calculating the "range".
The natural skin color can be darkened as a result of tanning due to exposure to sunlight. The leading theory is that skin color adapts to intense sunlight irradiation to provide partial protection against the ultraviolet fraction which produces damage and thus mutations in the DNA of the skin cells. Other factors that can modify skin color include protection from ambient temperature, infections, skin cancer or frostbite, an alteration in food, and sexual selection.
The social significance of differences in skin color has varied across cultures and over time, as demonstrated with regard to social status and racism.
... is cast off from the surface of the skin, particularly after a burn injury, but also seen in gangrene, ulcer, fungal infections, necrotizing spider bite wounds, and exposure to ... A newly identified human rickettsial infection, R ... if a skin graft is to be conducted) ...
... According to classical scholar Frank Snowden, skin color did not determine social status in ancient Egypt, Greece or Rome ... in a person's status than was their skin color ... The preferred skin tone varies by culture and has varied over time ...
... time, the tiny muscles that are contracting are causing a "bunching" of the skin surrounding the hairs, which results in the "bumps" in goosebumps ... its own heat by causing the hairs on the skin to stand up, thus reducing heat loss ... As the perspiration accumulates on the skin, it naturally evaporates ...
... Look up skin in Wiktionary, the free dictionary. ...
... In computing, a skin is a custom graphical appearance achieved by the use of a graphical user interface (GUI) that can be applied to specific software and websites to suit the purpose, topic, or ... A skin may be associated with themes ... Software that is capable of having a skin applied is referred to as being skinnable, and the process of writing or applying such a skin is known as skinning ...
Famous quotes containing the words color, human and/or skin:
“Surely the day will come when color means nothing more than skin tone, when religion is seen uniquely as a way to speak ones soul; when birth places have the weight of a throw of the dice and all men are born free, when understanding breeds love and brotherhood.”
—Josephine Baker (19061975)
“Take a decayed Christian ... and the remains of a Stoic; mix thoroughly with good manners, a bit of money and an old-fashioned education; simmer for several years in a university. Result: a scholar and a gentleman. Well, there were worse types of human being.”
—Aldous Huxley (18941963)
“I remember their smooth skin,
those newly delivered,
the pink skin and the serious China-blue eyes.
They came from a mysterious country
without the pang of birth,
born quietly and well.”
—Anne Sexton (19281974)