Leaving the titular riff on the classic reference work Gray’s Anatomy unacknowledged, Kay moves from skin-side to inside and back—beginning with the cloud of germs, dead cells, and “farticles” that surround us all, covering anatomical features from internal organs to hair and nails, and closing with a frank, if sometimes giddy, description of the reproductive system (“the male one is mostly on the outside, dangling there like a chandelier”), brisk and sensible remarks about death, and a final sweep past the immune system, allergies, and select good, bad, and “pukey” microbes. Though his coverage is so catch-as-catch-can that he identifies each layer in a tooth and all eight wrist bones but neglects to mention the pituitary or thyroid glands, he does include basic personal hygiene and nutritional guidelines, reassuring comments about acne (“face art”) and other signs of puberty, and strong opinions about smoking, hand-washing, and anti-vaxxers. He also tucks in descriptions of common conditions and diseases, from anxiety and depression to diabetes. Along with labeled cutaway views, Paker’s cartoons pick up on the droll tone with expressive faces on many body parts and germs and sight gags like a stack of tiny elephants posed next to rotated views of the spinal column.