There are those who obsess over their work—always on email, constantly thinking about the next big project, and glued to their planners like white on rice. And then there are others who strongly believe, “All work and no play makes Jack a dull boy.” They always have a pithy OOO message at the ready. The discrepancy may be explained by the stars. Here, the two zodiac signs that are relentless workaholics—and the one who can happily clock out when they need to.