Rice researchers 3D-printed these heads, fitted them with N95s and their own surgical mask hacks, and hooked them up to a particle measurement machine—called a Portacount —they acquired off eBay.

Everyone on campus is required to double mask with a surgical mask and cloth mask or wear a KN95 mask or N-95 mask. Drexel University is already back to in-person classes.

Thailand, which has reported a total of 70 cases, put surgical masks and sanitizers under its list of controlled goods last month, as the spread of the coronavirus led to shortages in stores.