Hair Science Overview
Hair is a remarkable fibre. It is composed of keratin, a strong fibrous protein, and is built from cells similar to those of your skin.
The average number of hairs on the human scalp is 120,000 — although those with fine hair (such as many blondes) tend to have more, and those with coarse hair (such as many redheads) tend to have less.
A healthy hair can stretch up to 30% of its length.
A hair strand can absorb its weight in water and swell up to 20% of its diameter.
A single scalp hair can hold a weight of 100g, and an average head of hair twisted together can support 23 tons! However, this is only if your hair is in good condition.