How much, how long

• the average number of hairs on your head: 100,000
• Redheads have 90,000 hairs
• Brunettes have 110,000
• Blondes have 140,000
• Hair on the head grows about 5/8 of an inch per month
• The lifespan of a hair is two to seven years
• Hair's average diameter is 0.1 milimeter
• Hair's weight-holding capacity is 100 grams
• At any given time ,90% of the scalp hair is growing while 10% is resting
• Normal hair loss is 100 strands per day
• Hair grows faster in summer, slower in winter

COLOR: TRUE FACTS

• Black is the most common hair color in the world, followed by brunette.
• Almost everyone who is 75 years of age or older has gray hair.
• Gray is an optical illusion created from intermixed white and dark hair.
• Natural blondes usually turn "white" instead of gray. They represent two percent of the world.
• Natural redheads are also far more likely to end up white than gray. A genetic mutation, they represent the rarest natural color.
• According to a 1996 study reported in the British Medical Journal, smokers are four times more likely to experience premature graying than non-smokers.
• The first known school for hairdressing in the United States was established in Chicago in 1890. The term "colorist" was first used in the late 1800s.