ABC podcast Little Tiny explores world history via the small things that have shaped it - all in the space of a coffee break! In this episode, host Kara Schlegl delves into the discovery of the cosmic microwave background. To hear more, search for Little Tiny on the ABC Listen app, or wherever you get your podcasts. Host Kara Schlegl Producer Bryce Halliday History consultant Zoë Tan Executive Producer Joel Werner