• Hair grows faster than any other tissue in the body, save for bone marrow.• The average scalp has 100,000 hairs or just fewer than 1,000 per square inch. Redheads have the least at 80,000; brown and black haired persons have about 100,000; and blondes have the most at 120,000.
• We are born with all of our hair follicles. Some are programmed to grow pigmented hair (as on our scalp) up to 1 metre in length.
• 35 metres of hair fibre is produced every day on the average adult scalp. 90% of scalp hairs are growing and 10% are resting.
• It is normal to lose 100 hairs per day from the scalp.
• A single hair has a thickness of 0.02 - 0.04mm, so that 20 - 50 hair strands next to each other make one millimetre.
• Hair is as strong as copper wire of the same diameter. It can stretch up to 20% of its original length before breaking when it is dry. When wet it may stretch up to 50% before breaking.
--Adapted from http://www.ukhairdressers.com/news3.asp, http://www.dermweb.com/skincare/hair/hairfact.html and http://www.keratin.com/aa/aa016.shtml
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