Time Travel: Hey, Grandpa

In the second episode of this two-part series, Robert and Allison check out the possibilities of travelling into the past. From wormholes to the grandfather paradox, there are many arguments for -- and against -- time travel. Tune in and learn more. Learn more about your ad-choices at https://www.iheartpodcastnetwork.com See omnystudio.com/listener for privacy information.