Right now, a lot of school districts across the country are making a pretty giant change to the way public education usually works. Facing teacher shortages and struggling to fill vacant spots, they are finding a new recruitment tool: the four-day school week.Those districts are saying to teachers, "You can have three-day weekends all the time, and we won't cut your pay." As of this fall, around 900 school districts – that's about 7% of all districts in the U.S. – now have school weeks that are just four days long.And this isn't the first time a bunch of schools have scaled back to four days, so there is a lot of data to lean on to figure out how well it works. In this episode, teachers love the four-day school week, and it turns out even parents love it, too. But is it good for students?*This episode was produced by Sam Yellowhorse Kesler with help from Willa Rubin. It was edited by Molly Messick and engineered by Maggie Luthar. Fact-checking by Sierra Juarez. Alex Goldmark is our executive producer. Help support Planet Money and get bonus episodes by subscribing to Planet Money+ in Apple Podcasts) or at plus.npr.org/planetmoney).*Learn more about sponsor message choices: podcastchoices.com/adchoices)NPR Privacy Policy)