This document discusses how learning has changed due to exponential growth of information but teaching has not changed to keep pace. It introduces the concepts of personal learning environments (PLEs) and "edgility," which is the ability to rapidly learn and innovate by leveraging networks. The document suggests that PLEs which aggregate content using tools like RSS can help learners stay current in a world where the half-life of knowledge is shrinking. It also provides some examples of PLEs and tools that can help find conversations on topics.