The book for May is “The Serengeti Rules: The Quest to Discover How Life Works and Why It Matters” by Sean B. Carroll. One of the most important revelations about the natural world is that everything is regulated--there are rules that regulate the amount of every molecule in our bodies and rules that govern the numbers of every animal and plant in the wild. And the most surprising revelation about the rules that regulate life at such different scales is that they are remarkably similar--there is a common underlying logic of life. Carroll recounts how our deep knowledge of the rules and logic of the human body has spurred the advent of revolutionary life-saving medicines, and makes the compelling case that it is now time to use the Serengeti Rules to heal our ailing planet. (280 pages).