Zoologist and bestselling author Bill Schutt chats with Trey Elling about PUMP: A NATURAL HISTORY OF THE HEART. Their discussion starts the importance of the hearts and circulatory systems of blue whales, horseshoe crabs, squids and octopuses, giraffes, crocodiles, and bats. Plus the ins and outs of the human heart, including the evolution of our understanding of this crucial muscular organ.