Go subscribe to Brainbook!    / @brainbook   or start with Alex's video on a day in the life of a neurosurgeon on call:    • Day in the life - Neurosurgeon on call  

The brain is a mass of neurons, but some areas are more important than others. How can surgeons navigate inside the brain? How do they know exactly where to operate, and what to do? Alex from Brainbook explains.