What the nose tells the mind

Why does coriander smell like soap to one person, but fragrant and delicious to another? Professor Ann-Sophie Barwich is a cognitive scientist, empirical philosopher and science historian who specialises in the incredible power of the human sense of smell. What does the nose tells the mind, and what we can learn about the sensory system from understanding this vital sense? Her book Smellosophy has just been published by Harvard University Press.