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Technology correspondent Zoe Kleinman explores how the use of computer algorithms and a more scientific approach are transforming the ancient art of matchmaking. Mathematician Chris McKinley tells how he cracked the code behind online dating, resulting in hundreds of responses from single women. Daniel Davis, professor of immunology at Manchester University, explains why we are genetically preprogrammed to prefer some sweaty shirts over others. Mathematical comedian Matt Parker provides a hard-and-fast rule to knowing how many people to date - or secretaries to interview - before settling on a candidate. And Dan Slater, author of Love In The Time Of Algorithms, talks us through the economics of online dating.