Hair

Hair is a special kind of protein filament that grows from tiny pockets called follicles in our dermis, the layer just under our skin. It helps make humans and other mammals different from many other animals. Our human body has many of these follicles. They can make thick, noticeable hair or very fine, almost invisible hair.

People often notice hair because of how it grows, the different types, and how to care for it. Hair is useful for scientists because it is a kind of biomaterial made mostly of a protein called alpha-keratin.

Hair can be straight, wavy, curly, or coily, depending on the shape of the hair shaft. The Andre Walker Hair Typing System is a popular way to classify hair types, ranging from straight (Type 1) to coily (Type 4). Each type has its own care needs.

Hair is mostly made of a special kind of protein called keratin. Our bodies can make many types of these proteins, which help give hair its strength and texture.

For humans, hair on the head helps keep us warm and cool, and it protects us from the sun's strong rays. Hair can also protect animals. Some animals, like hedgehogs and porcupines, have special hairs that turn into hard spines to scare away danger. Our eyebrows and eyelashes help keep dirt and sweat out of our eyes and also help us show feelings.

Different cultures and times have had many ideas about hair. How people style their hair or whether they remove it can show things like how old they are, their gender, or what they believe in terms of religion. Hair can be a way to express who we are and where we come from.

Hair care helps keep your hair clean and looking nice. It covers hair on your head, face, and body. People care for their hair in different ways depending on where they live and what their hair is like. You can change your hair in many ways, like coloring it, cutting it, or even removing it completely.

Different hairstyles can show things about a person, such as their group or beliefs. Hair can also show a person's age or health. For instance, white or gray hair usually means someone is older. Some people choose to dye their hair to cover this, while others let it be natural.