Engineering

Punching holes in opaque solar cells turns them transparent

Researchers in Korea have found an effective and inexpensive strategy to transform solar cells from opaque to transparent. Existing transparent solar cells tend to have a reddish hue and lower efficiency, but by punching ...

Computer Sciences

Scientists improve computer rendering of animal fur

The next computer-generated animals in King Kong or The Lion King could look a lot more realistic thanks to a breakthrough by computer scientists at the University of California.

Computer Sciences

Projection system shines makeup on actors during live performances

The facial appearance of actors can be transformed during live stage performances using a new advanced system developed by a team at Disney Research that can track an actor's movements and changing expressions so that the ...

Computer Sciences

Facial recognition is increasingly common, but how does it work?

The Trump administration's efforts to impose new immigration rules drew attention – and legal fire – for its restrictions on the ability of people born in certain majority Muslim countries to enter the U.S. In the frenzy ...

Engineering

Need hair? Press 'print'

These days, it may seem as if 3-D printers can spit out just about anything, from a full-sized sports car, to edible food, to human skin. But some things have defied the technology, including hair, fur, and other dense arrays ...

Engineering

3-D printing hair structures opens up fascinating design space

(Tech Xplore)—Scientific research into stuff—what things are made of, what they could be made of, what everyday applications could expand into groundbreaking applications with everyday materials—is very much alive and ...

Consumer & Gadgets

Fast-spinning, heat-controlling hair dryer latest Dyson opus

Sir James Dyson has built a company reputation based on pride of engineering quality focused on everyday objects, taking them to the next level of features and functions, supported all the more by sophisticated promotional ...

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Hair

Hair is a protein filament that grows through the epidermis from follicles deep within the dermis. The fine, soft hair found on many nonhuman mammals is typically called fur; wool is the characteristically curly hair found on sheep and goats. Found exclusively in mammals, hair is one of the defining characteristics of the mammalian class. Although other non-mammals, especially insects, show filamentous outgrowths, these are not considered "hair" in the scientific sense. So-called "hairs" (trichomes) are also found on plants. The projections on arthropods such as insects and spiders are actually insect bristles, composed of a polysaccharide called chitin. There are varieties of cats, dogs, and mice bred to have little or no visible fur. In some species, hair is absent at certain stages of life. The main component of hair fiber is keratin.

The hair can be divided into three parts length-wise, (1) the bulb, a swelling at the base which originates from the dermis, (2) the root, which is the hair lying beneath the skin surface, and (3) the shaft, which is the hair above the skin surface. In cross-section, there are also three parts, (1) the medulla, an area in the core which contains loose cells and airspaces (2) the cortex, which contains densely packed keratin and (3) the cuticle, which is a single layer of cells arranged like roof shingles.

This text uses material from Wikipedia, licensed under CC BY-SA