Here are three relevant quotes from an article in the Atlantic monthy entitled: “This Overlooked Variable Is the Key to the Pandemic” The red highlights are mine.
“In study after study, we see that super-spreading clusters of COVID-19 almost overwhelmingly occur in poorly ventilated, indoor environments where many people congregate over time—weddings, churches, choirs, gyms, funerals, restaurants, and such—especially when there is loud talking or singing without masks. . . .
Super-spreading can also occur indoors beyond the six-feet guideline, because SARS-CoV-2, the pathogen causing COVID-19, can travel through the air and accumulate, especially if ventilation is poor. . . .
But we don’t need to know all the sufficient factors that go into a super-spreading event to avoid what seems to be a necessary condition most of the time: many people, especially in a poorly ventilated indoor setting, and especially not wearing masks.”
Wear your durn masks, people!
The Owl Underground 
Thank you for repeating that! This is science, but not even rocket science. Wear a mask, avoid high risk situations especially indoors– care for yourself and be considerate of others. Pretty simple, why so hard for many people?
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