zoeyy
Active member
Have you ever wondered what makes human hair grow and how it's different from other mammals? 
Human hair grows at an average rate of about half an inch per month, and each strand of hair can last up to 7 years on your head. Interestingly, hair is mostly made of a protein called keratin, which is also what nails are made of!

Human hair grows at an average rate of about half an inch per month, and each strand of hair can last up to 7 years on your head. Interestingly, hair is mostly made of a protein called keratin, which is also what nails are made of!