Ed. note: Video of the Week picks are supplied by the editors of Common Sense Education, which helps educators find the best ed-tech tools, learn best practices for teaching with tech, and equip ...

Every educator knows what “a teachable moment” is. It’s the brief period of time when events serendipitously conspire to teach students something that otherwise might be difficult for them to learn.

All over the U.S., schools are using formative assessments to find out what their students know, and, before I go any further, let me make it clear that I think this is a good thing. Any well-run ...