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The more damage the hair sustains, the shorter the lifespan of the artificial hair. Most human hair extensions can be treated as real hair, albeit more gently. *Since human hair extensions are usually heavily processed to achieve uniform color and texture, a mild shampoo is recommended, along with a light conditioner to reduce tangling.
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Scalp hair was reported to grow between 0.6 cm and 3.36 cm per month. The growth rate of scalp hair somewhat depends on age (hair tends to grow more slowly with age), sex, and ethnicity. [3] Thicker hair (>60 μm) grows generally faster (11.4 mm per month) than thinner (20–30 μm) hair (7.6 mm per month). [4]
A sphere bundle is a fiber bundle whose fiber is an n-sphere. Given a vector bundle with a metric (such as the tangent bundle to a Riemannian manifold) one can construct the associated unit sphere bundle, for which the fiber over a point is the set of all unit vectors in .
Resembling hair-like projections, the stereocilia are arranged in bundles of 30–300. [3] Within the bundles the stereocilia are often lined up in several rows of increasing height, similar to a staircase. At the core of these hair-like stereocilia are rigid cross-linked actin filaments, which can renew every
Arm hair. Arm hair grows on a human's forearms, sometimes even on the elbow area, and rarely on a human's bicep, triceps, and/or shoulders. Terminal arm hair is concentrated on the wrist end of the forearm, extending over the hand. Terminal hair growth in adolescent males is often much more intense than that in females, particularly for ...