Astrophysicist Dr. Neil deGrasse Tyson discusses some of his favorite letters from fans on a diverse array of topics from Pluto and Bigfoot to race and religion. He shares touching personal letters from his cousin wondering about her deceased father’s spirit, and a mother whose autistic son is torn between what he learns in Hebrew school and what he learns from Cosmos. He talks about the tweet that enraged the musician Moby, the rapper who insisted that the earth is flat, and a man who asked Neil to help promote his "perpetual motion machine." Plus Neil answers your questions about black holes, the speed of light, the moon landing, and more. Order Neil deGrasse Tyson's new book Letters from an Astrophysicist on Amazon, Audible or wherever books are sold. Subscribe to his podcast Startalk on Apple Podcasts or wherever you like to listen, follow him on twitter at @NeilTyson, and visit his webpage at www.haydenplanitarium.org/tyson. Today’s episode was sponsored by Avalara sales tax solutions and Purple Mattress. Text KICK to 84-888 for a FREE Purple pillow with the purchase of a Purple Mattress. See omnystudio.com/listener for privacy information. Learn more about your ad choices. Visit megaphone.fm/adchoices