"YOU: The Owner's Manual" book by Dr. Oz and Dr. Roizen
is a humorous and easy read about the human body and how it functions.
It has metaphors to carpentry, electrical and plumbing.
Carpentry - bones and muscles
Air conditioning and heating - lungs and nose
Electrical - brain and nervous system
Water supply - heart and blood flow
Plumbing - mouth, tummy and intestines
Ch 7 - Concepts
2010sep23