Sunday, June 14, 2009
Human beings have about one million and four hundred thousand hairs on their body
, with about four hundred and fifty thousand of them to be found above the neck. These hairs include about one hundred thousand hairs on the head and about thirty thousand hairs taken up by mustaches, beards, or whiskers. The figure below illustrates average lengths of the hair (when it is left to grow naturally) and growth rates per day. The hairs on the head grow by about one centimeter per month and reach a length of around 70 centimeters if they are not cut. Hair grows at a faster rate in the spring and summer than in autumn and winter.