Necessary & Sufficient exists as an exploration of ideas (including those of duality, bifurcation, and hierarchy), a meditation on communication, a map of my mind, and a document of its own creation. Each week I record a conversation with a guest about a pair of related yet distinct concepts. The guest doesn't know about the topic in advance (I send them a set of index cards through the mail, which they open on-air) but I try to match up people with ideas that they will have some knowledge or opinion about. This isn’t a quiz, but an attempt to capture extemporaneous conversation and thoughts as they unfold between two people. Some topics are technical, some are general knowledge, but all are all open-ended in some way.