Tristram Wyatt gives a talk on 'The Science of Smell' - Pheromones, outlining their discovery, their chemistry and how animals (and humans) interact through smell. Part of the 2008 Oxford Alumni Weekend. Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales; http://creativecommons.org/licenses/by-nc-sa/2.0/uk/