We view our hair very differently from most of our fellow mammals. We pluck it and shave it, bleach it and color it, and curl it and straighten it as an expression of individual style. But for all the consideration and attention our hair seems to get, most of us don’t know very much about its origins and primary functions. To see hair in its entirety, you have to first go to the roots. This article covers hair structure and function, hair types, growth of hair and the hair cycle.