Perhaps the biggest accidental discovery story in the history of the universe. Well, definitely *about* the history of the universe. Greg tells Maren about a weird sound, and how two guys, Wilson & Penzias, figured out what it was, rocking the world of cosmology along the way. Expert: Professor Avi Loeb - Professor of Science at Harvard University, Chair of Harvard's Department of Astronomy, Founding Director of Harvard's Black Hole Initiative and Director of the Institute for Theory and Computation (ITC) within the Harvard-Smithsonian Center for Astrophysics  Sources: https://www.youtube.com/watch?v=cPalHdzsImc https://phys.org/news/2019-09-universe-billion-years-younger.html https://www.nbcnews.com/mach/science/universe-may-be-billion-years-younger-we-thought-scientists-are-ncna1005541 https://www.scientificamerican.com/article/smart-luck-how-the-big-bang-was-found-by-accident/  https://www.pbs.org/wgbh/aso/databank/entries/dp27bi.html https://www.livescience.com/65700-big-bang-theory.html  https://www.pbs.org/wgbh/aso/databank/entries/dp65co.html  https://study.com/academy/lesson/radio-telescope-definition-parts-facts.html https://www.atnf.csiro.au/outreach/education/pulseatparkes/radiotelescopeintro.html https://www.livescience.com/50399-radio-waves.html