Engine -- "The Real Stories Behind the Real People Who Make the World Work" -- is a narrative podcast, with co-hosts (and Philadelphia high school students) Lilianna Sand and Sarah Zdancewic, that tells stories from the lives of scientists who turn their greatest challenge into their most satisfying success. In this episode, "Flow," we meet a fluid mechanics researcher Kristy Schlueter-Kuck who found her purpose in the flow of the universe.