The document discusses how the brain is designed to scan for threats and rewards, releasing cortisol in response to threats and "happy chemicals" like dopamine, endorphin, oxytocin, and serotonin in response to rewards. It explains that when the world changes, old neural pathways for avoiding threats and gaining rewards can become unreliable. However, we can build new neural pathways by focusing on goals and taking small steps toward them to stimulate dopamine, and by creating opportunities to build social trust to stimulate oxytocin. Making new habits daily can help give the brain's electricity new places to flow and help us expect to feel good.