Looks at the role of electricity in the human body, covering the colorful history of how scientists discovered this role, the current state of knowledge of electrophysiology, and how new discoveries are driving advances in medicine.

The age of wonder -- Molecular pores -- Acting on impulse -- Mind the gap -- Muscling in on the action -- Les poissons trembleur -- The heart of the matter -- Life and death -- The doors of perception -- All wired up -- Mind matters -- Shocking treatment.