What is the structure of hair and how does it grow?
For many people, hair is a natural part of their look and an expression of their personality. Hair can also offer protection: For instance, it helps to keep the sun’s rays from reaching our scalp. Eyelashes and eyebrows keep dust, dirt and sweat out of our eyes. Even the hairs in our nose and ears help to keep out germs and other foreign objects. Body hair helps to regulate our body temperature: The hairs stand up when it’s cold, keeping the air that is warmed by the body close to the body – like a warming layer of air.