Do you ever wonder what makes us tick? The way we act, feel and even process information from the world around us? All of it starts with the brain. CNN's Chief Medical Correspondent Dr. Sanjay Gupta is tapping his decades of experience as a neurosurgeon to explore the many states of the brain – distracted, nourished, concussed, frightened and more. Our brains are in constant conversation with our bodies, so the condition of one can have direct effect on the other. Sanjay will provide insights into how to actually build a stronger brain and keep it sharp.