In order to understand the conditions that affect the children cared for in the Division of Neurology, we need to better understand underlying mechanisms. This study will enable us to understand how the brain and nervous system work. The goal of this study is to collect biological samples and medical information from children to create a Neuroscience Biorepository to advance future neurological research. Any patient with a neurological condition can participate. Please talk to your provider (Nurse Practitioner or Doctor) about opportunities for your children or their friends to help.