ALT A background grid with the grid size labeled as 10^-7 m (10 to the power of -7 meters, or 0.1 microns). Taking up a large part of the image is an orange and black oval-shaped thing labeled "largest virus" and at the bottom is a wavy line that crosses several grid lines labeled "wavelength of visible light". There's a diffraction pattern near the center labeled "limit of resolution for optical microscope" and in the middle, taking up about one square of the grid, is an illustration of a coronavirus.

ALT Using video to assess student attention in virtual class meetings. Do this: Give students choice. Conduct real time check-ins. Use digital assessment tools. Don't do this: connect students' video use to participation points, grades, or attendance; trick students into turning on their cameras; give students bonus points for having their cameras on. Why does this matter? Privacy, equity, safety, and personal concerns.