One problem is that there are too many definitions! And getting these four guests to agree on what consciousness is and what causes it, is a fun but hopeless task that is revelatory at the same time. These four leading brain scientists couldn't even agree on at what level a simple "memory" was stored, whether as a gross "brain circuit," at the synapse between nerve cells, or in the microstructure of the nerve cells as some sort of quantum effect. But why should it be any different now? Philosophers have debated the "mind-body problem" and the existence of "free will" for thousands of years. However, never before have we been in a position to examine the brain with such precision. Even as we begin to understand the deep science that underlies our cognitive processes, there is no letup in arguments whether we are anything other than automata, just reacting to stimuli -- vastly more complex than a bacterium to be sure -- but fundamentally little different.