This is the transcript for Brain Science 133, which is an interview with Dr. Suzanna Herculano-Houzel, author of The Human Advantage: How Our Brains Became Remarkable. Dr. Hurculano-Houzel is best known for the technique she invented that makes it possible to count the number of neurons in brains of all sizes. We talk about why this matters and some of the surprising discoveries that have come out of her work.