Black is the most common hair color while red is the rarest and only two percent of the world’s total population is blonde. You will only find one percent of redheads in the entire world.
Hair is 50 percent carbon, 21 percent oxygen, 17 percent nitrogen, 6 percent hydrogen and 5 percent sulphur. Hair is made up of a protein called Keratin. The same protein that makes up the fur, claws and beaks of animals.
Apart from the bone marrow, hair is the fastest growing tissue in the body. As soon as you pluck a hair from its follicle, another one starts to grow. Yet all hair on your head is dead, excluding the hair that is still under the scalp.
While humans might choose to discriminate between men and women, hair structure for both males and females are identical and the only thing that cannot be identified by your hair is your gender.
A single hair has a lifespan of about approximately five years and hair can grow anywhere on the body except for palms of the hand, soles if the feet, lips and mucous membranes. You should be thankful for that.
Each of your hair strands can support up to 100 grams of weight, which means a whole head of hair could support up to two tons. Almost equivalent to the weight of two elephants.
Your hair is like a little black book that contains information about everything that has ever been in your bloodstream and hence used as forensic evidence. Human hair continues to grow even after death.
The human body produces two main types of hair – vellus hair and terminal (androgenic) hair. Vellus hair is fine and covers most of the human body since childhood while terminal hair is thick and replaces vellus hair on certain body parts during puberty.
The first hair is produced by the fetal hair follicles is between the twelfth and the twenty-second week of pregnancy (gestation). This is called the lanugo hair.
On an average, you lose 50 to 100strands of hair per day. Men lose about40 hair a day while women lose about 70 hair a day and balding only becomes visible when you have already lost over 50 percent of hair from the scalp.
The hair on eyebrow are short while that on the scalp are relatively long. This is because hair cycle for eyebrows is completed in around 4 months, while it takes the scalp 3 -- 4 years to complete the cycle. The physical length of the hair depends on the duration of the hair cycle.