Internet dating has transformed our love lives. One in five committed couples meet on the internet and 91 million of us around the world log on to internet dating sites. Dr X and van Tulleken is one of them. An expert in public health issues at Fordham University in New York, he is hopelessly single, and looking for love. Can Dr Hannah Fry, lecturer in mathematics at University College London, use her statistical know-how to help secure him the partner of his dreams?