In this documentary, Professor John Wass, Professor of Endocrinology at Oxford University, highlights the importance of key hormones and the stories behind their discoveries. Hormones, a term coined by Ernest Starling from the Greek “haumea”, meaning “to excite”, is a fitting name for molecules which act on target cells resulting in a specific function. To date, more than 80 hormones of varying types, such as amines, peptides and steroids, have been discovered in humans. Professor Wass places prominence on testosterone, thyroid hormones, adrenalin and oestrogen. Moreover, the role of the pituitary gland, pancreas and fat cells in maintaining hormone levels is revealed. The greatly accomplished Professor Wass is a fantastic orator and has delivered a memorable and educational documentary.