Education reporter Jill Tucker takes you behind the scenes of the first day back in school in San Francisco. The district, among the last big public systems in the country to bring students back, opened 22 elementary schools, with more on the way. This is after months of worry over the coronavirus spreading, political bickering, labor negotiations and a lawsuit. There are challenges ahead, including a potential teacher shortage. | Unlimited Chronicle access: sfchronicle.com/pod Learn more about your ad choices. Visit megaphone.fm/adchoices