Tony joins us to discuss chapter 3 of William Lane Craig's book "On Guard." This chapter explores the Leibnitz Cosmological Argument which revolves around the distinction between objects that are contingent, and those that are necessary. Tony supports Craig's argument by claiming that all objects in the universe are contingent, so there must be a necessary entity somewhere to start it all. Emery, however, feels we don't know enough about matter to say that it's all contingent.