Over the summer, the high school where ... chalk sticks and markers. Dry-erase pens, on the other hand, have a number of components—plastic barrels, caps, filaments, and ink—so they’re ...

“There was this single-use dry erase marker,” McAllister said. “The body is plastic, the nib is plastic, the cap is plastic, the ink is soaked in plastic — it’s all garbage. So we ...