Of all the things that can help you lead a long, happy life, an overwhelming amount of scientific evidence points to one simple answer: Relationships. Studies suggest that relationships, not counting ones that are online only, are the ultimate antidote for increasing your odds of beating cancer, staving off dementia, recovering from heart attacks and a lot more. In fact, one gargantuan study of 309,000 subjects found that people who were actively involved in a community, playing a number of social roles, doubled their chances of survival over the 7 years of research. So spend more time forming stronger relationships. It will boost your happiness, and your happiness will boost your health and longevity.