As soon as Alternate Realities publishes, Zach Mack calls his dad to hear his reactions to the series. The conversation takes an unexpected turn, launching them into another year-long experiment.To listen to this series sponsor-free and support NPR, sign up for Embedded+ in Apple Podcasts or at plus.npr.org.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy