Dr. Katie Mack, a theoretical astrophysicist, walks #1 New York Times bestselling author John Green through the history of the entire universe - including the parts that haven’t been written yet. Watching the video for this podcast, you may notice a couple of glowing stars that represent each of our hosts. We loved how those stars represented our show so much, we embroidered them on an everyday dad-hat. Now you can contemplate the very nature of existence, take comfort in our relatively insignificant place in our universe, and look sharp-as-heck in the process. DETAILS Low profile "dad-hat" 100% cotton Black with white embroidery One size fits most.