Spatial Interaction from now on and I promised you a short piece that I had written as a general introduction but I don’t have it digitally. It is called “Spatial Interaction” in Encyclopaedia of Geographic Information Science edited by Karen Kemp, Sage, 2007, 417-419. I have the book in self-storage in Bath (don’t ask) and Paul Longley has a copy but he told me to tell you all to go the Library. UCL Library of course doesn’t even have a hard copy so Paul suggested I email Karen Kemp for the pdf. Lo and behold as soon as they woke up in Hawaii where she is, she sent me a copy of the download – yes the Encyclopaedia is online – so here is the printed download accessed by Karen from Hawaii, taken from the University of Southern California library, emailed to me for the blog. All in a couple of hours. The power of the net. Where will it end?