Answer: Research shows that to have a fulfilling career, you should do something you’re good at that makes the world a better place. Don’t aim for a highly paid, easy job, or expect to discover your “passion” in a flash of insight. Find out the six key ingredients of fulfilling work.

Answer: Many common ways to do good, such as becoming a doctor, have less impact than you might first think. Other, more unconventional options, have allowed certain people to achieve an extraordinary impact (including one particular Lieutenant Colonel in the Soviet military).