Science Friday 2021-07-30 Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email New CDC Mask Rules, Viral Persistence, Disaster Preparedness. July 30, 2021, Part 1 Gut Fungi, Olympic Challenges, Planetary Seismology. July 30, 2021, Part 2 Produced by Science Friday and WNYC Studios