February is all about celebrating Black history, and throughout the month we'll be honoring influential African Americans whose stories you might not yet know. Some are pioneers in their field, some helped spark the civil rights movement, and all have contributed incredible things to not only Black history, but to the history of the United States as a whole.Find out how Dr. Solomon Carter Fuller discovered the cause of Alzheimer's disease and became recognized as the first African American psychiatrist by watching the video above.