Duration: 04:50 | In the 1860s, scientists believed they were on the verge of uncovering the brain's biggest secret: how the brain's signals travel through the body. They believed these impulses travelled uninterrupted along a massive web of tissue. But soon, a young artist would cut down this hypothesis, and sketch a bold new vision of how our brains work. Melanie Peffer details the discoveries of Golgi and Cajal. [Directed by Artrake Studio, narrated by Bethany Cutmore-Scott].