Humans are hollow! Yes'you are basically just a tube, with a hole at each end. Food goes in one hole and . . . something else comes out of the other. But what goes on in between? This cleverly constructed pop-up book brings the gross, squelchy secrets of the digestive system to an audience who can truly appreciate it'kids. With easy-to-digest text and more pop-ups, pulls, and flaps than there are taste buds on your tongue, this book has it all: brains...