What causes that spark when we first meet someone? This week, Insight is joined by scientists who have been unlocking the secrets of attraction. While it may seem like magic or fate the way we sometimes look across a room and lock eyes with a stranger, there may be very good reasons. Our faces, bodies and even our smells, are signalling information to potential partners. For some us, one look is all it takes to fall in love – or lust. For others it’s all the clues in that first conversation that sends our brains in overdrive. New York biological anthropologist Helen Fisher, has been scanning the brains of people in love and there is some serious chemistry going on. UK psychologist Ian Penton Voak has spent years researching what we find attractive in faces. Dr Barnaby Dixson can tell us what we are drawn to in male and female bodies. And Dr Paul Eastwick has investigating what causes that initial attraction with speed dating experiments in the US. Join Insight as we test these theories of lust, love and attraction with those that are in love, out of love and looking for love.