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Science recently published a tour-de-force peer-reviewed article on the mechanics of aerosol transmission of respiratory viruses and infection mechanisms by expert researchers, with appealing graphics presenting the physical mechanics of aerosol creation, movement, inhalation, building airflow, masking and other mitigation strategies, along with extensive discussion and 205 references. Also see M. Olsen’s blog on “Infection prevention, emergency management and safety,” which includes a discussion of the multi-hour latency of COVID aerosols and the subsequent need to remain masked indoors even when alone if air circulation is substandard (and it likely is unless you are filtering it yourself). Currently the pandemic is thankfully in a downturn, but the kids aren’t vaccinated yet with winter coming on fast, so despite our pandemic fatigue, we still need to run the air filters, mask, and distance when possible. Want to measure air circulation quality? Check the CO2 levels. We are still trying...