→ PICTURE YOUR BRAIN as an intricate road map, networks of well-worn streets and highways laid out in every direction for wherever you want to go. Every time you book an Airbnb, figure out the tip on a bill, or laugh at a meme, nerve cells in your brain pass electrical messages along these networks of roads. When the signals move smoothly, they help you do all these things—get you excited about the trip, remind you to sign the receipt, stop you from laughing too loudly at the coffee shop, and so much more.
