Every day, at every moment of the day, we are surrounded by smells. The scent of soap, toast, loved ones, the city… The sense of smell, the most primitive of our 5 senses, is one of the most subtle and powerful. Danger, pleasure, emotion: it informs us about what surrounds us and enables us to broaden our perception of the world. What is our nose made of? How does our brain interpret the smell of a rose? How can a dog’s sense of smell save us from deadly diseases? Through some astonishing scientific experiments, let’s set off on a global olfactory voyage to discover a sense that leads us by the nose.