Biden Declares The COVID-19 Pandemic Over. Is It? During an interview with 60 minutes last weekend, President Joe Biden said “the pandemic is over.” “The pandemic is over. We still have a problem with covid, we’re still doing a lot of work on it. But the pandemic is over. If you notice, no one is wearing masks. Everybody seems to be in pretty good shape, “ Biden said at the Detroit auto show. This comment has prompted some dismay from the public health community. The World Health Organization hasn’t declared the pandemic over just yet. And the criteria to declare a pandemic over is nuanced and cannot be declared by the leader of a single country. Ira talks with Katherine Wu, staff writer at the Atlantic, about that and other top science stories of the week including a new ebola outbreak in Uganda, the latest ant census, and Perseverance’s rock collection.  Diving Into The Biggest Ideas In The Universe Can mere mortals learn real physics, without all the analogies? Dr. Sean Carroll, Homewood Professor of Natural Philosophy at Johns Hopkins University and author of The Biggest Ideas in the Universe: Space, Time, and Motion, says yes—if you’re willing to accept a bit of math. Carroll says that he dreams of a world in which ordinary people can have informed ideas on physics, and might argue about the latest black hole news as urgently as they might debate a sports team’s performance in last night’s game. His new book starts with some of the basics of motion that might be taught in an introductory physics class, then builds on them up through concepts like time and black holes. Carroll joins Ira to talk about the book, exploring where physics equations leave off and philosophical concepts begin, and the nebulous world in between. To read an excerpt of The Biggest Ideas In The Universe: Space, Time, and Motion, visit sciencefriday.com. Was Soylent Green Right About 2022? In the spring of 1973, the movie Soylent Green premiered. The film drops us into a New York City that’s overcrowded, polluted, and dealing with the effects of a climate catastrophe. Only the city’s elite can afford clean water and real foods, like strawberry jam. The rest of the population relies on a communal food supply called Soylent. There’s Soylent Red, Soylent Yellow… and a new product: Soylent Green. The year the film takes place? 2022. And spoiler alert: Soylent Green is people. While the 2022 the film depicts is—thankfully—much darker than our current situation, the message still holds up. When the film premiered, Rachel Carson’s Silent Spring and the Clean Air Act were very much in the country’s consciousness. 50 years later, warmer temperatures, soil degradation, and social inequality are more relevant than ever. Joining Ira to talk about the importance of Soylent Green 50 years later is Sonia Epstein, associate curator of science and film at the Museum of the Moving Image in New York City. Also joining is soil scientist Jo Handelsman, director of the Wisconsin Institute for Discovery in Madison, Wisconsin.  Saturn’s Rings Might Be Made From A Missing Moon Saturn’s rings are one of the most stunning, iconic features of our solar system. But for a very long time, Saturn was a ring-less planet. Research suggests the rings are only about 100 million years old—younger than many dinosaurs. Because Saturn wasn’t born with its rings, astronomers have been scratching their heads for decades wondering how the planet’s accessories formed. A new study in the journal Science suggests a new idea about the rings’ origins—and a missing moon may hold the answers. Co-author Dr. Burkhard Militzer, a planetary scientist and professor at UC Berkeley, joins Ira to talk about the surprising origins of Saturn’s rings. Want to know more? Listen to this previous Science Friday episode about Saturn’s formation.  Transcripts for each segment will be available the week after the show airs on sciencefriday.com.  Subscribe to this podcast. Plus, to stay updated on all things science, sign up for Science Friday's newsletters.