Radio waves aren’t sound. They’re electromagnetic radiation and essentially a type of invisible light. Radio astronomer Nicole Gugliucci joins us to explain how it's used to observe the formation of galaxies, black holes and other objects in outer space. Then, Gillian and Diona go on a field trip to see a meteor shower! It’s pretty much a disaster, but kind of hilarious and most definitely a blast. Stick around until the very end for an important announcement.

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Birds are simply captivating. We take a deep dive into their relationship dynamics, parenting habits and other behaviors with biologist and conservationist Wenfei Tong. Then, actress Olivia Scott Welch (Fear Street) stops by to help us share an incredible story from the Apollo Era. We also get a voice memo from Gillian’s co-star on Community, Joel McHale!

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Cities aren’t meant to last, according to writer Annalee Newitz. In their book “Four Lost Cities: A Secret History of the Urban Age,” they explore the rise and fall of ancient sites. What can architecture tell us about how we live? What can urban planning tell us about our changing values? And ultimately, why are cities abandoned? Later, we also dive into the story of a scientist who helped us understand the very structure of our DNA. Plus, we get a voice message from actress Sarah Ramos (Parenthood).

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