In her work with The Children's Miracle Network, Kelli Davis brushes shoulders with high-profile celebrities on a regular basis. These interactions have resulted in some surprising lessons about what makes people truly happy. In this episode of the podcast, Dr. Daniel Amen, Tana Amen, and Kelli describe what egoistic altruism is, and Kelli tells a heartwarming story of what happened when a famous superhero actor visited a children's hospital.