Are we alone in the universe, or are there other life forms out there? That's what Daniel, a listener from New Zealand, wants to know. Scientists have been searching for the answer with a surprising tool: radio. But this isn't any old radio. Seth Shostak, senior astronomer at the SETI Institute, shares the story of how the search for intelligent life got started, and where it's headed. Are you a teacher or homeschooling parent? Tell us how you use Tumble! Email us at firstname.lastname@example.org. We love hearing from you! Want an ad-free version of Tumble? It’s only $1 each month. Pledge on Patreon to get access to this special podcast feed, including Marshall’s original music. Let us know how you use Tumble. Send us your questions and drawings! Don’t forget to subscribe and leave us a review on Apple Podcasts or Stitcher. Thanks for listening!