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.