potassium into cells and without them, we would not survive.

Addressed to specialists in the field of biomedicine, the author presents a thorough overview of his scientific results over more than 40 years. The book is richly illustrated and seeks to explain how a single molecule creates the required conditions for our muscles to work.

Torben Clausen is professor emeritus of human physiology at the health faculty of Aarhus University, Denmark. The Nobel laureate, Jens Christian Skou, was supervising his doctoral thesis.