Thought of as the seat of our soul, then as a mysteriously animated object, the heart is still more a mystery than it is understood. Why do most animals only get one billion beats? (And how did modern humans get to over two billion - effectively letting us live out two lives?) Why are sufferers of gingivitis more likely to have heart attacks? And what does it really feel like to touch your own heart, or to have someone else's beating inside your chest?
"Great book and good narration too."
Rob Dunn, a biologist at North Carolina State University, writes about how digestion is far too messy a process to accurately convey in neat numbers.