You won't just be happier when you follow your passionate career path; you'll be better at it. IDEO's General Manager Tom Kelley quotes author Jim Collins who identifies a Venn diagram in every career path - the overlapping intersection of what you're good at, what you're born to do, what people will pay you to do, and finding a happy group of co-workers with whom to work. In the pursuit of self-discovery, Kelley suggests keeping a laboratory notebook tracking the happiest moments in life to discover our own true passions.