The electric heart
Inside a device that today can be as small as a coin, an ancient question lives on: how is the impulse that sets our cardiac muscle in motion created, how does it travel, and how can it be corrected? The answer begins with Luigi Galvani’s experiments on frogs, passes through the story of Swede Arne Larsson, who fainted as many as 20 times a day, and leads all the way to today’s most advanced wireless pacemakers