some of these fascinating processes and explores how the past would have smelt quite different to our ancestors, and how future technologies will further change the world of scents.

Along the way, leading scientist Bill S. Hansson recounts amazing stories from the world of olfactory research: from the tobacco plant that excretes an alarm odour, to mosquitos that cherish the smell of sweaty feet, to lilies that imitate the fragrance of a dead horse. Hansson explains why scientists are interested in the smell that surrounds teenage males, and how climate change affects the smell of our environment. He describes research trips to Christmas Island, where crabs with particularly keen noses crack coconuts on the beach, and outlines studies that reveal how penguins recognize their partner by their scent.

Born in Sweden, the neuroethologist Bill S. Hansson served as Vice President of the Max Planck Society and is currently Director of the Max Planck Institute for Chemical Ecology in Jena, Germany, and an honorary professor at Friedrich Schiller University. His research centres on the question of how plants and insects communicate through scent.