Even 6 foot rule might not be enough

So the 6 foot rule doesn't work if people are walking around, like in stores: "the choir outbreak is consistent with a growing body of evidence that the virus can be transmitted through aerosols — particles smaller than 5 micrometers that can float in the air for minutes or longer. Nearly three weeks later, 45 [choir members] have been diagnosed with COVID-19 or ill with the symptoms, at least three have been hospitalized, and two are dead. The outbreak has stunned county health officials, who have concluded that the virus was almost certainly transmitted through the air from one or more people without symptoms."
(And aerosols come from BREATH not just sneezes or coughs.)
Choir practice turns fatal. Airborne coronavirus strongly suspected
https://news.yahoo.com/choir-decided-ahead-rehearsal-now-023414705.html?.tsrc=daily_mail&uh_test=2_05
QUOTES:  A study published March 17 in the New England Journal of Medicine found that when the virus was suspended in a mist under laboratory conditions it remained "viable and infectious" for three hours — though researchers have said that time period would probably be no more than a half-hour in real-world conditions. AND With three-quarters of the choir members testing positive for the virus or showing symptoms of infection, the outbreak would be considered a "super-spreading event," he said.
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Kay Ebeling "transmitted through the air" that's why we have to wear masks. When people walk through a place without masks there could be infection left in the air for an amount of time that is unknown as of now...!
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Virus can also land in hair and beards and remain "viable and infectious" for an unknown time.