Guests: An interview with Neil Degrasse Tyson, an astrophysicist, host of the "StartTalk" podcast, and author of the #1 New York Times bestseller "Merlin's Tour of the Universe: A Traveler's Guide to Blue Moons, Black Holes, Mars, Stars, and Everything Far." This week's panel discussion includes Donna Brazile, Democratic political strategist and ABC News contributor; and Andrew Sullivan, writer of "The Weekly Dish" newsletter on Substack and author of the essay collection "Out On a Limb: Selected Writing."