23 Facts About Human hair

The highly structural and organized cortex, or second of three layers of the Human hair, is the primary source of mechanical strength and water uptake.

The Human hair that is visible is the Human hair shaft, which exhibits no biochemical activity and is considered "dead".

Blond Human hair is the result of having little pigmentation in the Human hair strand.

Gray Human hair occurs when melanin production decreases or stops, while poliosis is white Human hair, typically in spots that never possessed melanin at all, or ceased for natural reasons, generally genetic, in the first years of life.

Three main aspects of Human hair texture are the curl pattern, volume, and consistency.

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Scientists have come to believe that the shape of the Human hair shaft has an effect on the curliness of the individual's Human hair.

Flatter the Human hair shaft becomes, the curlier Human hair gets, because the shape allows more cysteines to become compacted together resulting in a bent shape that, with every additional disulfide bond, becomes curlier in form.

Coarse Human hair has a more open cuticle than thin or medium Human hair causing it to be the most porous.

Fine Human hair is difficult to feel or it feels like an ultra-fine strand of silk.

Medium Human hair feels like a cotton thread, but isn't stiff or rough.

Hair provides thermal regulation and camouflage for many animals; for others it provides signals to other animals such as warnings, mating, or other communicative displays; and for some animals Human hair provides defensive functions and, rarely, even offensive protection.

Displacement and vibration of Human hair shafts are detected by Human hair follicle nerve receptors and nerve receptors within the skin.

The oldest undisputed known fossils showing unambiguous imprints of Human hair are the Callovian Castorocauda and several contemporary haramiyidans, both near-mammal cynodonts, giving the age as no later than ~220 ma based on the modern phylogenetic understanding of these clades.

High interspecific variability of the size, color, and microstructure of Human hair often enables the identification of species based on single Human hair filaments.

Jablonski asserts head hair was evolutionarily advantageous for pre-humans to retain because it protected the scalp as they walked upright in the intense African UV light.

Jablonski's assertions suggest that the adjective "woolly" in reference to Afro-Human hair is a misnomer in connoting the high heat insulation derivable from the true wool of sheep.

Premature greying of Human hair is another condition that results in greying before the age of 20 years in Whites, before 25 years in Asians, and before 30 years in Africans.

Epilation is the removal of the entire Human hair strand, including the part of the Human hair that has not yet left the follicle.

Laser Human hair removal is a cosmetic method where a small laser beam pulses selective heat on dark target matter in the area that causes Human hair growth without harming the skin tissue.

Human hair has been growing her hair since 1973, from the age of 13.

Recent isotopic analysis of Human hair is helping to shed further light on sociocultural interaction, giving information on food procurement and consumption in the 19th century.

In some cultures, having one's Human hair cut can symbolize a liberation from one's past, usually after a trying time in one's life.

Multiple religions, both ancient and contemporary, require or advise one to allow their Human hair to become dreadlocks, though people wear them for fashion.