This is a fascinating article on how cities/populations grow. https://www.technologyreview.com/s/534251/astrophysicists-prove-that-cities-on-earth-grow-in-the-same-way-as-galaxies-in-space/ Meg McGaffin GIS Analyst City of Milford, CT<http://www.ci.milford.ct.us/> 203-783-3232 [log in to unmask] CT GIS User Network<http://ctgis.uconn.edu/index.htm> ------------------------------------------------------------------------- This list (CTGIS-L) is an unmoderated discussion list for all CT GIS Users. If you no longer wish to receive e-mail from this list, you can remove yourself by going to http://listserv.uconn.edu/ctgis-l.html