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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. Orders of magnitude (length) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(length)

   181 μm – maximum width of a strand of human hair [25] 100–400 μm – length of Demodex mites living in human hair follicles; 175–200 μm – typical thickness of a solar cell. 200 μm – typical length of Paramecium caudatum, a ciliate protist; 200 μm – nominal width of the smallest commonly available mechanical pencil lead (0.2 mm)

4. 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]

5. Hair - Wikipedia

   en.wikipedia.org/wiki/Hair

   The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair. Most common interest in hair is focused on hair growth , hair types, and hair care , but hair is also an important biomaterial primarily composed of protein , notably alpha-keratin .

6. This Is How Much Hair Loss Is Normal—and What’s Not ... - AOL

   www.aol.com/lifestyle/much-hair-loss-normal-not...

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7. Dermatologists Say These Hair Oils Promote Long, Thick ...

   www.aol.com/dermatologists-hair-oils-promote...

   These best hair growth oils recommended by dermatologists can help promote healthier, fuller-looking locks. ... and red clover to increase the appearance of hair density and thickness. ...