Eddy gets a zit, which Double D tells him is a natural part of growing up. Eddy is embarrassed about it and tries to hide from the other kids. Ed finds the zit funny and gets Jonny to come over and see it, to Eddy's dismay.
Beakman explains how hair grows starting with the hair follicle, why hair falls out and why different hair is different lengths. He also explains why hair is not living and how hormones affect hair growth.