Most of us talk with our hands, some more than others, but what are we really saying? Susan Golden Meadow, PhD, professor of psychology and comparative human development at the University of Chicago, is an expert on gestures – what they mean, why they don't always agree with what words we are using, and even how they develop in blind children who have never seen them. Plus... why you should never use the thumbs-up sign in Iran! For more information, transcripts, and all episodes, please visit https://thisisyourbrain.com For more about Weill Cornell Medicine Neurological Surgery, please visit https://neurosurgery.weillcornell.org