“Military-grade camera shows risks of airborne coronavirus spread” https://www.adn.com/nation-world/2020/12/11/military-grade-infrared-camera-shows-risks-of-airborne-coronavirus-spread/ (click icon to open)
Note: “According to experts, the footage underrepresents the potential risk of exposure from airborne particles. Those particles may spread farther or linger longer than the visible exhalation plume, which dissipates quickly to a level of concentration the camera can no longer detect.”
Eideard 
This will get him to wear the mask.
https://www.nbcchicago.com/lx/another-reason-to-wear-a-mask-covid-19-may-cause-erectile-dysfunction/2386588/?fbclid=IwAR2M0UkOV_IggD9vFKdKHpr1wPdhQ_xlPj_u6cwWj3YFdAPAHLLtIVHU6yY
“Military-grade camera shows risks of airborne coronavirus spread” https://www.adn.com/nation-world/2020/12/11/military-grade-infrared-camera-shows-risks-of-airborne-coronavirus-spread/ (click icon to open)
Note: “According to experts, the footage underrepresents the potential risk of exposure from airborne particles. Those particles may spread farther or linger longer than the visible exhalation plume, which dissipates quickly to a level of concentration the camera can no longer detect.”