When I was at Caltech (1968-1973), the Nobel laureate neurophysiologists I spoke with, such as Roger Sperry, told me “there are roughly ten billion, 10 to the power of 10, brain cells in your head.” Back then, neurons were thought to be doing memory, thought, and consciousness alone. Glia (Greek for “glue”) were demoted to a supporting role regulating a neuron’s environment, helping it to grow, and being the physical scaffolding. When I studied Brain Science in graduate school, the experts told me “there are roughly ten billion brain cells in