The purpose of the American College of Radiology Normative Neuroimaging Library project (the “Library”) is to create a large collection of brain MRI scans and other information from healthy individuals. The Library will be a resource for doctors and scientists to compare the MRI scans of people with disorders or diseases with the MRI scans of healthy people. In addition to the brain MRI scans, we are also collecting information from participants that may relate to brain structure or function, such as age, gender, handedness, medical history, and tests about how people think. This kind of information may help doctors and scientists better understand and diagnose brain disorders and diseases, such as traumatic brain injury, post-traumatic stress disorder, neurodegenerative diseases (like Alzheimer’s, Parkinson’s or ALS), and many other problems.