Urban scaling is a very new topic that has received considerable attention recently in the field of complexity and beyond. For this subunit, we are bringing you two videos put out by the Santa Fe Institute's Cities, Scaling, and Sustainability group, describing their research. We have also posted two papers from this group on the Supplementary Materials page. This subunit is followed by an interview with the leader of this group, Professor Luis Bettencourt of the Santa Fe Institute.