@basketcase
Care to respond to this:  
https://www.cnbc.com/2021/04/23/mit...ndoors-at-6-feet-or-60-feet-in-new-study.html
“We argue there really isn’t much of a benefit to the 6-foot rule, 
especially when people are wearing masks,” Bazant said in an interview.
“It really has no physical basis because 
the air a person is breathing while wearing a mask tends to rise and comes down elsewhere in the room so you’re more exposed to the average background than you are to a person at a distance.”
		 
		
	 
If "there really isn't much benefit to the 6-foot rule", then he is admitting that there is a benefit to the 6 foot rule with or without masks. 
And how much is "much benefit"? Where is his evidence supporting or quantifying this? 
If he thinks there's not much difference between being 6 feet away from an infected SP, for example,  and 2 feet away or 6 inches away or DFK her, then he's an idiot. 
As for his second statement, if you are the lone customer in a store that just opened after being closed all night, & there for a short time, i suggest there is little if anything to be concerned about virus in the environment from the previous day's customers. His statement also doesn't consider virus droplets & aerosols that plunge to the floor at a distance of 6 feet, but at a much closer distance would hit another person's face and infect them.