Dr. R. Douglas Fields walks us through some of his fascinating discoveries in neuroscience. In the first part of his talk, he describes the research identifying neural circuits responsible for sudden aggression - from road rage to violence that fills the daily news. In the second part (starting at 28:54), he presents the roles and functioning of glia - strange brain cells that communicate without electricity. Glia comprise 85% of all cells in the brain and play very important roles, yet they were largely overlooked until recently.