Jason Corosanite learned an important lesson this spring: 25 students is too many for a Zoom call. “When we first went to distance learning,” Corosanite, co-founder of the String Theory Schools public charter school network in Philadelphia, says, “we had all the kids logged on at once.” It didn’t work. As Corosanite explains, students would “turn off, hide in the background.” School officials have the final word on reopening. “We think being in and in-person to the greatest extent that we can is super important,” Corosanite says.