 We've had guests on the show talking about the lizard brain, and I'm sure many in our audience are going to be shocked to realize that there is no such thing as a lizard brain. So where did that concept come from and why is it so pervasive in neuroscience? The idea that we have an inner beast, right, is a really old idea in Western philosophy of the human mind. And you can trace ideas like this all the way back to Plato, right? Plato had this idea that he dramatized as stallions and a charioteer. And so one stallion are instincts and another stallion stands in for the emotions. And then you've got the human charioteer who's wrestling these beasts into submission. And this was really not an origin story of humanity. It was more of a morality story.