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2. Hair's breadth - Wikipedia

   en.wikipedia.org/wiki/Hair's_breadth

   This measurement is not precise because human hair varies in diameter, ranging anywhere from 17 μm to 181 μm [millionths of a metre] [8] One nominal value often chosen is 75 micrometres (0.0030 in), [5] but this – like other measures based upon such highly variable natural objects, including the barleycorn [9] – is subject to a fair degree of imprecision.

3. Artificial hair integrations - Wikipedia

   en.wikipedia.org/wiki/Artificial_hair_integrations

   Artificial hair integrations, more commonly known as hair extensions, hair weaves, and fake hair add length and fullness to human hair. Hair extensions are usually clipped, glued, or sewn on natural hair by incorporating additional human or synthetic hair. These methods include tape-in extensions, clip-in or clip-on extensions, micro/nano rings ...

4. Andre Walker Hair Typing System - Wikipedia

   en.wikipedia.org/wiki/Andre_Walker_Hair_Typing...

   The Andre Walker Hair Typing System, also known as The Hair Chart, is a classification system for hair types created in the 1990s by Oprah Winfrey's stylist Andre Walker. [ 1 ] [ 2 ] [ 3 ] It was originally created to market Walker's line of hair care products but has since been widely adopted as a hair type classification system .

5. Equivalent radius - Wikipedia

   en.wikipedia.org/wiki/Equivalent_radius

   US hat size is the circumference of the head, measured in inches, divided by pi, rounded to the nearest 1/8 inch. This corresponds to the 1D mean diameter. [1] Diameter at breast height is the circumference of tree trunk, measured at height of 4.5 feet, divided by pi. This corresponds to the 1D mean diameter.

6. 23andMe cuts 40% of its workforce, discontinues all therapy ...

   www.aol.com/23andme-cuts-40-workforce...

   Genetic testing firm 23andMe said on Monday it is reducing about 40%, or 200 employees, from its workforce and discontinuing further development of all its therapies as part of a restructuring ...

7. Human hair growth - Wikipedia

   en.wikipedia.org/wiki/Human_hair_growth

   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]