English: In this video we will be looking at nonlinear social dynamics and self-organized criticality, as we talk about how positive and negative feedback can give us a model for interpreting these dynamics. We will briefly discuss how negative feedback can give us a relatively stable process of development involving counterbalancing forces that maintain the system within some equilibrium. We then go on to talk about a nonequilibrium process of change where this negative feedback loop gets broken and positive feedback coupled with negative externalities leads to rapid unsustainable development, within this dynamic, path-dependence, lock-in and heightened percolation all lead to eventual criticality and a phase transition. For full courses, transcriptions & downloads please see: http://www.complexityacademy.io