For the next week, Mike passes the mic to a few guest hosts. Today, Annie Duke, former professional poker player and author of Thinking in Bets: Making Smarter Decisions When You Don't Have All the Facts takes the helm. On the Gist, Annie recaps the unifying messages from Sen. Sanders and V.P. Biden from the virtual 2020 Democratic National Convention. In the interview, Annie talks with Jay van Bavel, an associate professor of psychology and neuroscience at NYU, about how extreme partisanship occurs when traditional beliefs are not updated in rational ways, especially when it comes to wearing a mask during the global pandemic. Prof. van Bavel explains how a partisan mind interprets information in a way that affirms their identity, and how that might lead them to stray from the path of facts. In the Spiel, the consequences of partisanship. Email us at thegist@slate.com Podcast production by Daniel Schroeder and Margaret Kelley. Slate Plus members get bonus segments and ad-free podcast feeds. Sign up now. Learn more about your ad choices. Visit podcastchoices.com/adchoices