?Good morning, class. Today we are going to learn about Earthlets. They come in four colours. Pink, brown, black or yellow? but not green.? In this way Dr. Xargle, our friendly alien teacher, begins to teach his class about humans and babies.This is an hysterically funny book, with a particularly wry look at our natural methods and practices in bringing up babies: look out for the ?egg-mangle??will you ever want to eat it again?