Since some time now I have wondered why human hair keeps growing unlike in animals were it is replaced continuessly.This seems to be a huge boilogical differance and not just a fluke of nature. What is the reason for human hair to grow as long as it likes? I have done some reseach on the internet and nobody seems to know what I'm talking about. I would even research the matter my self if nobody has done it, which seems to be the case, or has some one?