These produce oil which flows along the length of the hair and the health of the root determines the overall health of the strand of hair.
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Related: strand
Prev: You could actually draw out a 36,000-kilometer strand or ribbon of nanotubes stronger than steel, but maybe a thousandth the thickness of a human hair.
Next: There's some variation depending on hair colour but for an average adult the strand count is 100,000, so losing 100 a day is not too bad.
