This calendar is an easy-to-digest guide to the inner workings of our bodies. Written by anti-aging expert Michael Roizen and heart surgeon Mehmet Oz, each page presents important health information in the form of exercise tips, nutritional suggestions, simple lifestyle changes, myth busters, and factoids like this one: Size isn't everything. The size of your brain is purely a function of genetics, not an indication of your intellect.O, The Oprah Magazinenamed the book as one of the five best health books of 2005. The calendar is based on the No. 1New York Timesbest-selling book.