Many thanks to the Ayn Rand Center for Individual Rights for posting the full audio of a speech delivered at Purdue University by Rand herself as well as the Q&A that ensued. (Speech 57:19 minutes; Q&A 53:24) The Speech is entitled "Faith and Force: The Destroyers of the Modern World." It is a sweeping lecture on the impact of philosophy throughout history. Ayn Rand explains why mysticism is altruism’s precondition, and why dictatorship is its product. It is an oral presentation of an article Rand published under the same title. The speech and Q&A available here.