So I was talking this week with my parents, who remember the polio epidemics of the 40s and 50s. Each summer the virus would flare up in different cities and regions. When there were outbreaks in a particular locality, movie theaters and bowling alleys would shut down, and swimming pools and beaches would be closed. It seems to me the present situation is not unlike a polio outbreak where the air is a swimming pool, the entire country is a movie theater.
Viscosity 