The Human Hair

The Human Hair Summary

• Average number of hairs on the head: 100,000
• With reddish hair: 90,000
• With black hair: 110,000
• With blond hair: 140,000
• Maximal length of hair: 70 to 90 cm
• Annual growth: 12 cm
• Female hair grows more slowly than male hair
• Male hair is more dense than female hair
• Lifespan of hair: 2 to 7 years
• Diameter of hair: 0.1 mm
• Load-carrying capacity: 100 grams (~one chocolate bar)
• Humidity stretches the hair
• Combing is less detrimental than brushing
• Correct shampooing will not dry out the hair
• Frequent washing does not increase loss of hair
• Hair grows faster in warm weather
• Elderly people have slower hair growth and diminished hair density
• Cutting hair does not influence its growth
• Spliced ends can not be repaired and need to be cut
• Wet hair should not be rubbed since hair is very sensitive