Usually when we talk about electricity we're talking about the technology that runs the modern world, but electricity is a lot more integral to our existance than making our tech work. Without electricty our bodies don't know how to move, see or hear, and the history of how we came to understand what electricity is and what it can do is wrapped up in our exploration of biology. Rachelle Saunders speaks with Tim Jorgensen, author of the new book "Spark: The Life of Electricity and the Electricity of Life", about the intertwined nature of electricity and life and how we came to understand it better.