There are many popular stream libraries for Scala developers, including Akka Streams, scalaz-stream, fs2, plus others in the Java ecosystem. While all excellent choices for building reactive Scala applications, their reliance on effects makes them particularly difficult to test and reason about. In this talk, long-time Scala functional programmer John A. De Goes takes to the stage to demonstrate a new approach to modeling streams that requires less machinery and has more reasoning power, composability, flexibility, and testability than many other approaches. By attending the talk, you'll learn how the best stream library may be the one you get for (co)free!