"...and suddenly it hits you: Human skin is actually made up of billions of tiny units of protoplasm, called "cells"! And what is even more interesting, the ones on the outside are all dying! This is a fact. Your skin is like an aggressive modern corporation, where the older veteran cells, who have finally worked their way to the top and obtained offices with nice views,are constantly being shoved out the window head first, without so much as a pension plan,by younger hotshot cells moving up from below."