“There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don’t know. But there are also unknown unknowns. There are things we don’t know we don’t know.” Donald Rumsfeld
Listen to the ABC Melbourne program broadcast on 8 August 2018 with ASA Vice-President, Dr Peter Seal, Virginia Trioli and Sally Warhaft talking about anaesthesia.