 It actually wears it if it's not a proper type of flow. Portions of the brain can actually be damaged. And once you get the cerebral spinal fluid going right, all of a sudden the brain is starting to actually regenerate. So we have pre and post MRIs where once we've got the cerebral spinal fluid moving right, then all of a sudden the brain repair is actually occurring. People are starting to function better. It really can make some dramatic changes in function.