Texas Monthly:

To explore the inner workings of the heart is to discover a form and a function that can inspire thoughts of the divine in the most determined atheist. It is a marvel of strength, efficiency, and tenacity. About the size of a human fist—your fist, custom-designed to your unique size—it nestles perfectly at an angle deep inside the chest, protected by the rib cage and a cushion of lungs. Weighing about eight to eleven ounces, about the same as a running shoe, it has four hollow chambers, two atria and two ventricles that look, in pictures, like ancient temples carved out of caves. Those hollows hold perfectly regulated amounts of blood. The heart also has its own system of valves, muscles, and electrical currents that make sure nothing goes wrong. In fact, it’s easy to believe in the heart as a perpetual-motion machine: it beats 60 to 100 times per minute, about 115,000 times a day, more than 2.5 billion beats in an average lifetime.

This is a book excerpt. It’s visceral and fascinating. It has me hooked.