It was about 10:20 a.m., during fourth period on a recent Friday at North Allegheny Senior High School, and Rob Greenleaf was teaching his sociology class. He doesn’t remember what happened next.

When I was in second grade, my class made a small tile for a project about what we wanted to be when we grew up. Mine said I wanted to be a teacher. My mom kept that tile all these years. Recently I ...

Forbes contributors publish independent expert analyses and insights. Talia Milgrom-Elcott nurtures belonging & advances STEM. In the midst of challenge, teachers are still sparking wonder—and helping ...