One hair follicle produces 20 to 25 hairs.

On average, a hair grows 0.35 mm within 24 hours, which is approximately 12 cm within a year.

The most suitable water temperature for washing the hair is 35 to 45┬░ C.

On average, a hair strand's life span is five and a half years.

On average, a human scalp has 100,000 hairs.

Next to bone marrow, hair is the fastest growing tissue in the human body.

Hair will fall out faster in case of an unbalanced diet, lacking the vitamins and minerals.

Each hair consists of 3 layers: the cuticle, cortex, and medulla.

Hair is made of keratin, the same substance that forms nails and the barrier at the top of the skin.

Water content in your hair can reach 30%.

Due to large quantities of female hormones, women's hair is more protected from testosterone and thus less prone to hair loss.

Hair grows faster in summer than in winter, it also grows faster during the day than at night.

The chance of the hair turning gray increases 10-20% every decade after age 30 years.

Healthy hair is highly elastic and can be stretched by 20 to 30% before rupture.

Hair can absorb much moisture, it can hold one third of its weight.

When it is wet, it is more elastic.

Hair is composed of dead cells made up of a tough protein called keratin (a protein that is also the main component of nails), which is why having your hair and nails cut doesn't hurt.

Hair is curly or straight, depending upon the number of disulfide bonds between hair proteins found in the hair shaft.

Cutting, dyeing, bleaching or permanent waving is not recommended immediately before and during menstruation.

Increased estrogen levels may change the effect.

During the menstruation cycle the scalp is more sensitive.

During pregnancy, the hair is often more supple and radiant.

If we don't cut the hair, it will grow up to 90 cm.

Men have more hair follicles per square centimetre than women.

The diameter of a hair is 0.1 mm.

Hair grows faster in warm weather.

With age, hair grows thinner.

Combing the hair with a comb causes less damage than brushing it.

Hair texture depends on the size and shape of the hair bulb, which in turn depends on the genetic predisposition, age and race.

Hair color is determined by the quantity of hair pigment and the shape of pigment cells.

In very cold weather hair becomes more dry and brittle.

Human hair is stronger than copper wire of the same thickness.

On average, blondes have 140,000 hairs, people with brown hair have 102,000 to 109,000 hairs, people with black hair have 110,000 hairs and redheads have 90,000 hairs.

The reason why hair turns gray as we age is because the pigment cells in the hair follicle start to die and cease to produce melanin which gives the hair its color.