Article content Periodic heat-wave days can make in-person learning next-to-impossible, especially with COVID-19 still lurking in and around schools. Students and teachers in Quebec learned that, once again, when schools reopened briefly in June. Two school boards in the Outaouais were forced to declare two “heat days” and keep children out of classrooms. What’s most surprising is that, until quite recently, few researchers had actually studied the effects of excessive heat on student learning. Now we know, more definitively, that heat exposure does adversely affect student learning and global warming will make it worse. We apologize, but this video has failed to load.