Introduction Introduction Results Discussion Methods AUTHOR CONTRIBUTIONS Competing interests Appendix References While the two major types of cells in the brain are known to be glia and neuron, the true ratio of glia to neurons in the brain remains a mystery. One of recent studies using efficient cell counting method provides compelling evidence for 1:1 ratio on four whole human brains 1. The same study also reveals that the ratio of glia to neurons in the brain varies from one region to another, sometimes dramatically, e.g., 3.76:1 in the cerebral cortex versus 1:4.3 in the cerebellum 1,2. However, other scientists have argued that more rigorous studies are needed in which just about every known ...