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 ...

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 ...

Consumer & Gadgets

At CES, beauty products pamper with AI

Salon-worthy manicures at home and expert skin care advice from artificial intelligence: the beauty industry is counting on tech to get consumers pampered like the rich and famous.

Engineering

Scientists film sound waves in a crystal

To predict how materials behave, one must first know their characteristics. Further, suppose you want to manipulate or design new materials and have them serve some technological purpose in, for example, electronic or photonic ...

page 2 from 3

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