Could alien life forms really contact human beings? How would they do it? Is it possible that other humans could intercept the message -- and keep it secret? Listen to this classic episode to learn more. Learn more about your ad-choices at https://www.iheartpodcastnetwork.com They don't want you to read our book.: https://static.macmillan.com/static/fib/stuff-you-should-read/ See omnystudio.com/listener for privacy information.