The brain is not only the regulator of our entire body, but also the basis for the experiences we’re having, good or bad. We’re pretty dependent on our brain, according to Dr. Rick Hanson. He’s a psychologist and New York Times best-selling author of many books about the brain and happiness. “So, one of the key takeaways here is to realize that this phenomenal organ -- three pounds of tofu-like tissue inside the coconut between your ears -- is vulnerable and fragile,” Hanson says.