 This week, Delaware Public Media's Joe Irizarry sat down with Dr. Justin Martello, director of Christiana Care's Parkinson's and Movement Disorders Program and Focused Ultrasound Program, to learn more about this ultrasound treatment. Dr. Martello, before we get to the ultrasound treatment, let's unpack Parkinson's disease. I think most people have a surface-level understanding of what it is, but can you give us an overview of the disease, what causes it, and why it results in physical shaking and tremors?