September 7, 20232:57 PM ET Sequoia Carrillo & Beth Wallis https://www.npr.org/player/embed/1198269007/1198301913# This week, sweltering heat has forced districts around the country – up and down the East coast and across the Midwest – to close schools early or switch to virtual learning. Even more schools canceled outdoor activities and after-school sports. The term "heat [...]