“To get a picture of what’s going on, Heilman says, start by thinking of the brain as a forest full of trees. “Think of a neuron, or a nerve cell, as one of those trees,” he says. In this analogy, the cell body forms the tree trunk; there are major branches, known as axons, and smaller branches, dendrites, that extend out to the farthest reaches. “In the brain, some of those trees are closer together than others, and the branches communicate with each other.” As this happens, “neural connections” are formed, which can produce new thoughts, ideas, and insights.”