It’s back to school for the The New York Times Knowledge Network. The Times Co. on Thursday rolled out the second year of online programs, with 47 programs at 15 educational institutions and organizations across the country. The expanded roster of fall programs runs the gamut: business, writing, history, health and politics. The Knowledge Network combines education from several institutions, along with exclusive content from the Times archive. Participating institutions include Arizona State University, Center for Strategic and International Studies (CSIS), Mediabistro, New York University – School of Continuing and Professional Studies and Stanford University.