Average adults' heart beats 72 times a minute. In a lifetime it creates enough energy to drive the truck to the moon and back and generates astonishingly 2,5 gigajoules of energy. Yet, cardiac arrests and heart diseases are major causes of death worldwide, despite decades of research.

How much further we'll have to go before we solve this problem? To discuss Jonathan was joined by Sian Harding, Emeritus Professor of Cardiac Pharmacology at the National Heart and Lung Institute, Imperial College London, and author of The Exquisite Machine. The New Science of the Heart.