Facts about Human Hair31 interesting facts about human hair. Things you migth already know and amazing facts that will have you surprised.
Absorbing: Hair in good condition can absorb 30% of its own weight in water. When the hair has been weakened (damaged), this percentage can increase to 45%. Hair can absorb oil out of water and has been used to soak up oil spills.
Chemotherapy: Chemotherapy drugs are toxic compounds that target rapidly growing cells. Chemotherapy also kills certain cells that divide more rapidly, such as hair follicles. This causes hair loss. Hair will grow back after chemotherapy and the new hair may be just like the old hair, or it may be straighter, curlier, thicker or a different color.
Color: The most common natural hair color in the world is black (about 84%). About 11% have brown hair. Only 2-3% of people are natural blondes. The rarest hair color is red and it is only found in 1-2% of the world’s population.
Dead: Hair is dead tissue. The only part of hair that is not dead is within the scalp. Hair is made of protein that originates in the hair follicle. When the cells mature, they fill up with a protein called keratin. The cells lose their nucleus and die as they travel up the hair follicle.
Diameter: The diameter of a hair does not have a standard value since different people have different hair. Your genetic make-up decides whether you have thick or thin hair. The diameter of a human hair ranges from 0.017 to 0.18 mm (0.00067 to 0.00709 inch). In general, women’s hair is half the diameter of men’s hair. As the weather gets warmer, the diameter of hair increases. Hair becomes thicker and stronger when you grow up and the closer to the root, the thicker a strand of hair will be.
Dyeing: 75% of women dye their hair. In the 1950s only 7% of American women colored their hair. An increasing number of American men are dyeing their hair.
Fetus: The first identifiable hair follicles appear on the fetus at about 9 weeks. All of the hair follicles you have and that you will ever have develop when you are a fetus at 4 to 5 months. A 9 month fetus normally has all the hair follicles that will ever develop in that person.
Follicles: The human body has about 5 million hair follicles. This number takes into account all the hair on various parts of the body.
Food: L-cysteine is an amino acid added to many baked goods in order to speed industrial processing. L-cysteine can be found in cow horns, duck and chicken feathers and petroleum byproducts, but most of it is extracted from human hair.
Gender: The gender of the person a hair came from cannot be determined unless there is nDNA (nuclear DNA) evidence such as the root. Hair is divided into two parts: the shaft which is what you see above the surface of the skin and the root which is below the skin. For DNA testing to be successful hairs must be plucked or torn from the scalp, with the root attached.
Gold: Hair strands can contain 14 different elements, including zinc, copper, manganese and … gold.
Goosebumps: Goosebumps are a physiological phenomenon inherited from our animal ancestors. They develop when a person is cold or experiencing strong emotions. Some believe that its function in our ancestors was making them appear larger to scare off predators. Goosebumps are formed when tiny muscles at the base of hair strands contract and pull the hair erect.