With every droplet that we can’t see, touch, or feel dispersed into the air, the threat of spreading Covid-19 persists. It’s become increasingly critical to keep these heavy droplets from lingering — especially on surfaces, which are welcoming and generous hosts. Thankfully, our chemical cleaning products are effective, but using them to disinfect larger settings can be expensive, dangerous, and time-consuming. Across the globe there are thousands of warehouses, grocery stores, schools, and other spaces where cleaning workers are at risk. With that in mind, a team from MIT’s Computer…