Dr. Adam Frank (U of Rochester) first discusses the history of our search for extra-terrestrial intelligence (SETI), including the Drake Equation, the Fermi Paradox, and the searches for radio messages from other civilizations that have taken place since 1960.  He then explains how new research and funding is expanding our thinking about the ways we might find evidence of intelligent life among the stars.  He focuses on "techno-signatures" -- ways in which we might identify signs of alien technology.  Dr. Frank summarizes the work in papers he has published and the research and ideas of scientists around the world.  (Recorded May 26, 2021.)