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In case anyone is interested, I will be talking about the "Mathematics of Networks and Maps" at the Hay Festival of Literature and the Arts this coming Tuesday, the 30th of May, at 10am. https://www.hayfestival.com/p-12268-rhyd-lewis.aspx The talk will be 45 minutes long, and I am told that it will also be live-streamed on the festival website https://www.hayfestival.com/. Below is a copy of the abstract. Thanks Rhyd Lewis, School of Mathematics, Cardiff University. ABSTRACT: How do satnavs find the quickest route from one town to another? What’s the most efficient way to visit the best pubs in the UK? Is it true that all living things in the world are six or fewer degrees of separation away from each other? The Cardiff mathematician shows, pictorially, how the many problems in everyday life can be modelled as networks: from the colouring of maps to the way Facebook makes friend recommendations.