Well, any kid who got really excited by the snot in the title may end up being a bit disappointed, as the text is not quite as slimy as it claims to be.  But the science is there, and well-explained to cover a wide range of things related to breathing, from snoring, to asthma, to assorted diseases.  The cartoonish illustrations are engaging, and the diagrams help explain the text, and the information is broken up into small enough blurbs to keep it from being too dry and overwhelming, even if it’s not quite as slimy as one might have hoped.  And it’s got a good sturdy binding, too.